How to Reduce Hot Water Usage in Commercial Buildings
The fastest wins come before you spend a dollar on new hardware: lower your storage setpoint to 120–140°F, fix leaks, schedule your recirculation pump off during unoccupied hours, insulate exposed hot-water piping, and verify thermostatic mixing valves are calibrated correctly. Those five steps alone can recover 8–10% of water-heating energy in many operations, according to [ACEEE restaurant field testing](https://www.aceee.org/files/proceedings/2008/data/papers/9_243.pdf).
TL;DR
- Measure before you replace: Establish a 30-day utility and submetering baseline before any equipment decision to right-size upgrades and document rebate-eligible savings.
- Operations and controls first: Recirculation scheduling, setpoint adjustment, and mixing valve calibration can cut DHW energy by 10–33% with minimal capital outlay.
- Match equipment to use case: HPWHs deliver up to 52% energy savings where ambient conditions allow; condensing gas suits high continuous demand with existing gas service; tankless fits intermittent or new-construction scenarios.
- Stack incentives before purchasing: Combine ENERGY STAR utility rebates, Mass Save programs, and federal Section 179D credits to reduce net installed cost by 30–60% before calculating payback.
- Mystic Valley Home Services: Provides commercial DHW audits, controls retrofits, and equipment installations in Massachusetts, with commissioning reports that support utility rebate claims.
How to prioritize tactics: quick wins vs. capital upgrades
Quick wins to act on this week:
- Lower setpoint: Drop storage temperature to 120°F where Legionella controls allow, or install a master mixing valve and store at 140°F while delivering at 120°F.
- Fix leaks: A dripping hot-water fixture wastes thousands of gallons per year and the energy to heat them.
- Schedule recirculation: Turn off or slow recirculation pumps during nights, weekends, and unoccupied periods.
- Insulate piping: Wrap all accessible hot-water supply and return lines, especially in unconditioned spaces.
- Audit fixtures: Replace pre-rinse spray valves and faucet aerators with low-flow models rated at 0.5–1.0 GPM.
Field studies show high-efficiency water heater upgrades in restaurants produce 8.6–19.5% gas savings, while a monitored commercial heat pump water heater (HPWH) installation delivered about half the energy use of a baseline electric resistance unit. Those numbers set a realistic ceiling. Most facilities land somewhere in between, depending on how much low-hanging fruit remains in their operations.
Sequencing matters more than most facility managers realize. Replacing equipment before fixing operational waste means you size the new system to an inflated load, overspend on capacity, and still pay for avoidable losses.
Tier 1: No-cost and low-cost operational fixes (do these first)
Start with setpoint adjustment, leak repair, recirculation scheduling, and fixture controls. These require minimal capital and often produce measurable savings within the first utility billing cycle. Retro-commissioning, which means checking that existing equipment runs as designed, belongs here too. Mis-set mixing valves, stuck recirculation check valves, and uncalibrated aquastats are common culprits that cost nothing to fix once identified.
Tier 2: Controls and analytics (do these second)
Submetering your domestic hot-water (DHW) plant, adding temperature sensors on recirculation returns, and deploying runtime logging for pumps and burners gives you the data to prove savings and identify the next opportunity. Analytics-first approaches often pay back faster than capital replacements because many losses are operational, not equipment-driven. A monitored 12-story medical office building cut DHW energy by 33% and saved roughly $15,500 per year in gas costs simply by correcting overscheduled recirculation pumps, recalibrating mixing valves, and optimizing setpoints.
Tier 3: Distribution fixes (mid-cost, high leverage)
Pipe insulation, heat traps, and demand-controlled recirculation retrofits fall here. These typically cost a few thousand dollars for a mid-size facility and pay back in one to three years.
Tier 4: Capital equipment upgrades (budget these last, sized to the corrected load)
Replace water heaters only after Tiers 1–3 have reduced your baseline load. You will right-size the new equipment, qualify for larger rebates on higher-efficiency units, and shorten payback.
Pro tip: Document your utility baseline for at least 30 days before starting Tier 1 fixes. That baseline is what you use to claim utility rebates and to calculate actual savings after each measure. Skipping it means leaving incentive money on the table.
Which equipment types actually deliver commercial hot water savings
### Heat pump water heaters (HPWHs)
HPWHs move heat from ambient air into water rather than generating it directly, which is why ENERGY STAR reports commercial HPWHs can use less than half the energy of electric resistance units, saving at least 10 MWh annually per unit under the ENERGY STAR commercial specification. They perform best in spaces that stay above 50°F year-round and where daily hot-water volumes are large enough to justify the equipment cost.
The catch: HPWHs need adequate floor space, sufficient ambient air volume (typically 1,000 cubic feet or more per unit), and a condensate drain. In very cold mechanical rooms without supplemental heat, performance drops and backup resistance elements carry more of the load, which erodes savings.
In foodservice, pairing HPWHs with ENERGY STAR-rated dishmachines that use a cold-water supply for sanitizing can cut required HPWH capacity significantly, because dishmachines account for a large portion of daily hot-water use at many restaurant sites. Smaller required capacity means lower installed cost and faster payback.
### Tankless (on-demand) water heaters
Tankless units eliminate standby losses entirely by heating water only when a fixture calls for it. They work well in facilities with intermittent or variable demand, such as offices, small retail spaces, or as point-of-use units near isolated fixtures far from the central plant. For high-simultaneous-demand applications like commercial kitchens or laundries, you typically need manifolded banks of units to meet peak GPM, which adds installation complexity and cost.
Life-cycle-cost modeling shows tankless can be cost-effective in gas-heated new-construction scenarios, particularly where gas rates are low and electric rates are high. In retrofit situations with existing gas infrastructure, they are often the lowest-disruption upgrade path.
### Condensing gas storage water heaters
They require a condensate drain and typically a PVC or stainless flue rather than a B-vent, which adds installation cost in retrofits. For facilities with high continuous hot-water demand and existing gas service, condensing storage is often the most cost-effective upgrade when electric rates make HPWHs less attractive.
### Solar preheat systems
Solar thermal collectors preheat cold supply water before it reaches the primary heater, reducing the energy the heater must add. Upfront costs are higher than other options, but federal tax credits and state incentives can materially reduce net cost. Solar preheat pairs well with any backup technology and is worth evaluating for facilities with south-facing roof access and high annual hot-water loads.
| Equipment type | Typical efficiency | Typical installed cost shape | Simple payback range | Best-fit use cases | Space/ventilation needs | Maintenance complexity | Fuel sensitivity |
|---|---|---|---|---|---|---|---|
| Commercial HPWH | Up to 2x–3x more efficient than electric resistance; ENERGY STAR: saves ≥10 MWh/yr | Higher upfront; lower operating cost | 3–5 years (with incentives) | Large daily volumes, laundries, multi-family, foodservice with efficient dishmachines | Large floor area, >50°F ambient, condensate drain | Moderate (refrigerant circuit, annual service) | High benefit where electricity rates are moderate and gas is expensive |
| Tankless/on-demand | Eliminates standby loss; high thermal efficiency | Moderate; manifolding adds cost for high flow | 2–5 years | Offices, intermittent demand, point-of-use, new construction | Minimal floor space; gas venting or dedicated circuit | Low to moderate | Cost-effective where gas rates are low |
| Condensing gas storage | 90–96% thermal efficiency vs. 60–80% conventional | Moderate to high (flue retrofit may be needed) | 3–7 years | High continuous demand, existing gas infrastructure | Standard footprint; PVC/stainless flue, condensate drain | Moderate | Less attractive where gas prices are rising |
| Solar preheat | 40–70% annual load offset (climate-dependent) | Highest upfront; incentives reduce net cost | 5–12 years (pre-incentive) | High annual loads, south-facing roof access, any backup fuel | Roof area, collector mounting, storage tank | Low to moderate (collector cleaning, glycol checks) | Fuel-agnostic; reduces demand on any backup heater |
Operational and maintenance measures that cut waste without capital spending
### Setpoint management
Storing hot water at 140°F and delivering it through a master mixing valve at 120°F is the standard approach for facilities that need Legionella control without scalding risk. For lower-risk applications, guidance from the University of Maryland Extension indicates that reducing storage temperature to around 120°F can lower water-heating energy use by 6–10% and slow mineral buildup. ASHRAE 188 requires facilities to assess Legionella risk; consult your local health authority before dropping setpoints below 140°F in systems with long distribution loops or dead legs.
### Tank flushing and heat-trap inspection
Sediment accumulation on tank bottoms acts as insulation between the burner and the water, forcing longer firing cycles. Flushing tanks quarterly in hard-water areas removes this buildup. Heat traps, which are dip tubes or check valves that prevent thermosiphoning when no fixture is calling, should be inspected annually; a failed heat trap can add measurable standby loss.
### Recirculation pump scheduling
A recirculation pump running 24/7 circulates hot water continuously through distribution piping, losing heat to the surrounding space the entire time. Scheduling the pump to run only during occupied hours, or switching to demand-controlled recirculation triggered by a push button or motion sensor, eliminates most of that standby loss.
### Fixture and process controls
EPA WaterSense guidance recommends low-flow faucets, efficient pre-rinse spray valves, and ENERGY STAR dishmachines as core hot-water demand reduction measures for restaurants and commercial facilities. Pre-rinse spray valves rated at 0.5 GPM replace older 1.6 GPM models with no operational change and cut hot-water use at that fixture by roughly two-thirds. For restaurant plumbing upgrades, these fixture swaps are often the fastest-payback items on the list.
### Staff behavior programs
Behavioral measures are underrated. A short training session covering why hot-water waste costs money, how to report dripping fixtures, and when to run dishmachines at full load rather than partial cycles can produce consistent reductions. Posting water-use targets near sinks and dishwashing stations reinforces the habit.
How distribution piping and recirculation design drive hidden losses
Most facility managers focus on the water heater and overlook the distribution system, which is where a large share of energy and water waste actually occurs. Long recirculation loops running at high temperature, uninsulated pipes in unconditioned spaces, and oversized pumps running at full speed around the clock can collectively waste as much energy as the heater itself.
### Distribution heat loss drivers
Heat loss from distribution piping is proportional to pipe surface area, temperature differential between the pipe and surrounding air, and the quality of insulation. A 1-inch uninsulated copper pipe in a 60°F mechanical room loses roughly 30–50 BTU per linear foot per hour at 130°F supply temperature. Multiply that across hundreds of feet of piping in a large commercial building and the annual loss is substantial. Adding pipe insulation to accessible runs is one of the highest-return investments in DHW efficiency.
### Demand-controlled recirculation and ECM pumps
Demand-controlled recirculation replaces continuous pump operation with event-triggered circulation, either from a push button at the fixture, a motion sensor, or a time-of-use schedule. Variable-speed ECM (electronically commutated motor) pumps reduce electricity consumption further by running at lower speeds during low-demand periods.
### Master mixing valves and distribution setpoints
A demand-controlled master mixing valve (DMMV) stores water at a higher temperature for Legionella control while delivering it at a lower temperature to fixtures, reducing distribution heat loss. A California field study of DMMV retrofits found an average energy reduction of about 4.5% across five demonstration sites, though results ranged from roughly 11.4% savings at the best site to negative savings at one site where installation quality was poor. That variability underscores why commissioning matters as much as the hardware itself.
Understanding why hot water recirculation systems matter is the starting point for any distribution optimization project.
Pro tip: Install a temperature sensor on the recirculation return line and log it for two weeks before making any changes. If the return temperature is within 5°F of supply, your loop is well-insulated and the pump schedule is the main lever. If the return is 20°F or more below supply, you have a heat-loss problem in the distribution piping that insulation or loop redesign should address before you touch the pump schedule.
| Distribution measure | Typical savings range | Notes |
|---|---|---|
| Pipe insulation (uninsulated runs) | 8–10% of water-heating energy | Higher savings in unconditioned spaces; payback often under 2 years |
| Recirculation pump scheduling (timer/occupancy) | 10–20% of water-heating energy | Low cost; requires timer or simple controller |
| ECM variable-speed pump retrofit | 50–80% reduction in pump electricity | Pump electricity is a small fraction of total DHW energy but adds up |
| DMMV retrofit | Average ~4.5% (range: negative to ~11.4%) | Site selection and commissioning quality drive outcomes |
| Analytics and controls optimization | Up to 33% DHW energy reduction (monitored case) | Highest leverage when operational issues are the root cause |
How to size the right solution and estimate payback
Sizing a commercial DHW system to the corrected load, not the historical peak, is the single most common mistake in equipment replacement projects. Oversizing means higher upfront cost, shorter burner cycles (which reduce efficiency in storage units), and longer payback.
The key sizing inputs are:
- Daily gallons: Total hot-water consumption per day, measured or estimated from fixture counts and usage schedules.
- Peak GPM: The simultaneous flow rate during the busiest 15-minute period. This drives storage volume or recovery rate requirements.
- First-hour recovery: For storage units, how many gallons the heater can deliver in the first hour from a full tank.
- Spare capacity for peak processes: Kettles, dishmachines, and laundry equipment create sharp demand spikes. Size for these separately or use a buffer tank.
- Electrical capacity and panel headroom: HPWHs and electric tankless units require significant amperage. A panel upgrade can add $5,000–$15,000 to installed cost and extend payback by one to two years.
For payback estimation, the math is straightforward. At an installed cost of $12,000 (after rebates), simple payback is 4.4 years.
Life-cycle-cost modeling shows HPWHs often have lower life-cycle costs than electric storage units, while tankless can be cost-effective in gas-heated new-construction scenarios where gas rates are low. In Massachusetts, where electricity rates are above the national average, the HPWH economics depend heavily on available rebates and the specific utility rate structure.
A field-measured HPWH installation achieved a 3.2–4.4 year simple payback under California commercial rates. Massachusetts facilities with access to Mass Save rebates and federal tax incentives can often reach similar payback windows despite higher electricity costs.
Installation checklist items that affect payback:
- Electrical service capacity (amps available for HPWH or electric tankless)
- Venting requirements (PVC for condensing gas; no flue for HPWH)
- Floor space and ceiling height for HPWH units
- Condensate drain proximity
- Panel upgrade need (adds cost; factor into payback calculation)
- Permit and inspection timeline (can delay savings start date)
Rebates, tax credits, and financing for commercial hot-water projects
Federal tax credits: The Inflation Reduction Act extended and expanded commercial energy efficiency tax credits. Section 179D allows commercial building owners to deduct up to $5.00 per square foot for qualifying energy efficiency improvements, including water-heating systems. Consult a tax advisor for current eligibility rules and phase-out schedules, as these provisions have specific requirements around energy modeling and certification.
ENERGY STAR-based utility rebates: Most U.S. utilities offer rebates for ENERGY STAR-certified commercial water heaters, including HPWHs, condensing gas units, and high-efficiency tankless models. In Massachusetts, Mass Save offers prescriptive rebates for commercial customers on qualifying equipment. Rebate amounts vary by utility and equipment type; check your utility's current program before specifying equipment, since rebate structures change annually.
State decarbonization grants: Massachusetts and several other states have active decarbonization grant programs targeting commercial building electrification.
On-bill financing and performance contracting: Some utilities offer on-bill financing that lets you repay the equipment cost through utility bill savings over three to seven years, with no upfront capital required. Performance contracting through an energy service company (ESCO) is another path for larger projects, where the contractor guarantees savings and is paid from those savings over the contract term.
The most effective approach is to identify your target equipment, confirm ENERGY STAR certification, then contact your utility's commercial account manager and your state energy office before signing a purchase order. Rebates are often first-come, first-served and can be exhausted mid-year.
How to measure savings and run a pilot before full rollout
Committing to a full equipment replacement without a measurement baseline is how facilities end up with new equipment and no proof of savings. A 30–90 day pilot on one zone or one piece of equipment gives you real data to justify the broader project and right-size the full installation.
### Minimum metering checklist
- Utility meter baseline: pull 12 months of gas and electric bills before any changes.
- DHW submetering: install a BTU meter or flow meter on the DHW plant to isolate hot-water energy from space heating.
- Flow and temperature sensors on recirculation returns: these reveal distribution losses and pump scheduling opportunities.
- Runtime logging for pumps and burners: a simple data logger on the pump contactor and burner call shows actual operating hours versus design assumptions.
### Pilot design
Define a baseline period of at least 30 days with no operational changes. Then implement one measure at a time, measure for another 30 days, and calculate savings. Weather-normalize gas consumption using heating degree days if the DHW system shares a gas meter with space heating. For electricity, normalize by occupancy or production volume if those vary seasonally.
Commercial water metering is the foundation of any credible pilot. Without it, you are estimating, not measuring.
Analytics platforms and remote telemetry can compress the pilot timeline by flagging anomalies in real time rather than waiting for monthly bill reconciliation. The medical office case study that achieved 33% DHW energy reduction used analytics to identify the specific operational issues before any hardware was replaced.
| Pilot metric | What to measure | How to use it |
|---|---|---|
| Baseline kWh or therms (DHW only) | Submetered BTU or gas meter (DHW circuit) | Denominator for all savings calculations |
| Peak GPM | Flow meter during busiest 15-minute period | Confirms sizing assumptions for equipment replacement |
| Recirculation return temperature | Temperature sensor on return line | Identifies distribution heat loss and pump scheduling opportunity |
| Pump runtime hours | Data logger on pump contactor | Quantifies recirculation scheduling savings |
| Fixture flow rates | Handheld flow meter at each fixture type | Confirms low-flow fixture performance and identifies leaks |
Real-world savings ranges by sector
Measured outcomes vary by building type, baseline efficiency, and which measures are applied. The ranges below come from documented field studies, not manufacturer claims.
Restaurants and foodservice: ACEEE field testing in restaurants found high-efficiency water heater installations produced 8.6–19.5% gas savings. These two categories of measures are additive in most facilities.
This is a best-case scenario for a well-sited HPWH with adequate ambient conditions.
Medical office and commercial buildings (analytics-driven): The 12-story medical office case showed a one-third reduction in DHW energy and substantial annual gas savings from operational corrections alone, with no equipment replacement.
DMMV retrofits (multi-site average): The California field study reported an an average modest energy reduction across several sites, with substantial variation by site.
| Site type | Measures applied | Measured savings | Payback (where reported) |
|---|---|---|---|
| Restaurants (multiple sites) | High-efficiency water heaters (tank or tankless) | 8.6–19.5% gas savings | Not reported in field study |
| Restaurants (multiple sites) | Retro-commissioning (insulation, pump controls, flue damper) | ~8–10% gas savings | Typically under 2 years |
| Commercial HPWH (field trial) | HPWH replacing electric resistance unit | ~52% energy savings; ~10,000 kWh/yr | 3.2–4.4 years |
| Medical office building (12-story) | Analytics, pump scheduling, valve recalibration, setpoint optimization | 33% DHW energy reduction; $15,500/yr gas savings | Not reported |
| Multi-site DMMV retrofit (5 sites) | Master mixing valve installation | Average ~4.5% energy reduction | Varies by site |
Variability is real. A restaurant that already has efficient equipment and good operational practices will see smaller gains than one running 1990s-era equipment with a 24/7 recirculation pump. Site-specific measurement is the only way to set accurate expectations.
What to ask commercial plumbing and HVAC contractors
Hiring the wrong contractor for a commercial DHW project is expensive. Undersized equipment, missed rebate deadlines, and poor commissioning can turn a 4-year payback into a 10-year one.
- Ask for documented commercial DHW experience. Request references from at least two commercial projects involving the specific equipment type you are considering (HPWH, condensing gas, or tankless manifold). Residential experience does not transfer directly to commercial sizing and code requirements.
- Ask how they size equipment. A qualified contractor will ask for your daily gallon usage, peak GPM, and first-hour recovery requirements. If the answer is "we'll match what you have now," that is a red flag. Matching existing equipment perpetuates oversizing.
- Ask about their metering and commissioning plan. Any contractor proposing a significant equipment upgrade should include a baseline measurement period and a post-installation verification step. No metering plan means no proof of savings and no rebate documentation.
- Ask about controls and analytics experience. Recirculation pump scheduling, mixing valve calibration, and submetering are part of a complete DHW project. A contractor who only replaces the heater and leaves the controls unchanged is leaving savings on the table.
- Ask about permit and code compliance. Commercial water heater installations require permits in Massachusetts. Confirm the contractor pulls permits, coordinates with the local plumbing inspector, and addresses any health-department requirements for Legionella control (ASHRAE 188 compliance).
- Ask for a written commissioning report. This document should include measured supply and return temperatures, pump runtime settings, mixing valve setpoints, and confirmed flow rates at key fixtures. It is also the documentation your utility rebate program will likely require.
Red flags: a contractor who recommends replacement without first reviewing operational data, who cannot name a specific ENERGY STAR-certified model, or who has no examples of measured savings from prior commercial projects. Preventive plumbing maintenance contracts from a qualified contractor also protect the investment after installation.
How water quality affects hot water system efficiency
Hard water is one of the most underestimated threats to commercial DHW efficiency. In Massachusetts, water hardness varies significantly by municipality, and facilities drawing from harder water sources accumulate scale inside tank liners, on heat exchanger surfaces, and inside tankless heat exchangers faster than those on softer supplies.
Scale acts as an insulating layer. In tankless units, scale buildup can trigger high-limit shutoffs and reduce flow capacity, which shows up as complaints about inconsistent hot-water delivery during peak demand.
The practical response is a water quality assessment before specifying equipment. If total hardness exceeds 7–10 grains per gallon (120–170 mg/L), a water softener or scale inhibitor system upstream of the DHW plant is worth the cost. For HPWHs and condensing units with stainless or copper-nickel heat exchangers, the manufacturer's warranty often requires water quality within specified limits.
Corrosion is the other side of the coin. Aggressive low-pH water attacks copper piping, solder joints, and anode rods in storage tanks. Annual anode rod inspection and replacement in storage water heaters is a low-cost maintenance item that extends tank life by years. Neglecting it is one of the most common reasons commercial tanks fail prematurely.
For facilities on municipal supplies, request a current water quality report from your utility. For well-supplied facilities, commission an independent water test that covers hardness, pH, chloride, and total dissolved solids. Pairing this with routine heating system maintenance practices gives you a complete picture of what is degrading your system efficiency.
The case for measuring before replacing
Most commercial hot-water projects I review have the same structural problem: the facility manager calls a contractor, the contractor recommends a new water heater, and the new unit goes in without anyone establishing what the old system was actually consuming or why. Three months later, the bills are similar to before, and nobody can explain why.
The analytics case from the medical office building is the clearest illustration of what gets missed. No new equipment. The savings were sitting there, invisible, until someone put sensors on the system and looked.
My view, grounded in how these projects actually play out: the measure-first approach is not just a best practice, it is the only approach that protects your capital. When you know your baseline, you can right-size equipment, claim rebates with documentation, and verify that the contractor's work actually delivered what was promised. When you skip it, you are trusting a sales estimate.
Mystic Valley Home Services scopes every commercial DHW project starting with a baseline audit. We identify what is wasting energy before recommending any hardware. That sequencing is what makes the savings real and the payback predictable.
Mystic Valley Home Services helps Massachusetts commercial clients cut water-heating costs
For commercial property owners and facility managers in Massachusetts, Mystic Valley Home Services offers a direct path from audit to verified savings. The process starts with a commercial DHW audit: we establish your utility baseline, submeter the DHW plant, and identify the specific operational and equipment issues driving your costs. From there, we handle controls retrofits, pipe insulation, recirculation pump scheduling, and full equipment installations including HPWHs, condensing gas units, and tankless systems.
We also offer preventive maintenance contracts that keep your DHW system performing at the efficiency level the installation achieved, with annual anode rod checks, mixing valve calibration, and tank flushing included. Every project includes a commissioning report with measured pre- and post-installation data, which is what your utility rebate application will require.
To schedule a commercial DHW audit or get a quote for a specific upgrade, visit our commercial services page or call us directly. We serve commercial clients across Massachusetts.
Useful resources and where to check incentives
- ENERGY STAR Commercial Water Heaters: Certified product lists, efficiency specifications, and links to utility rebate programs for HPWHs, condensing gas, and tankless units.
- EPA WaterSense: Saving Water in Restaurants: Fixture-level recommendations for low-flow aerators, pre-rinse spray valves, and ENERGY STAR dishmachines.
- ACEEE Restaurant Water Heating Case Studies: Field-measured savings data for high-efficiency water heaters and retro-commissioning measures in foodservice.
- iFactory DHW Analytics Case Study: Documented 33% DHW energy reduction in a commercial office building from analytics-driven operational corrections.
- CalNext DMMV Field Study: Five-site field study of master mixing valve retrofits with measured savings and variability data.
- CalNext Foodservice Electrification Report: Dishmachine hot-water load data and HPWH sizing guidance for foodservice electrification.
- Building America / EERE Water Heating Technology Comparison: Life-cycle-cost modeling across HPWH, tankless, and storage technologies.
- Massachusetts commercial building water conservation tips: Local guidance on reducing hot-water consumption in Massachusetts commercial facilities.
For current rebate amounts, check your utility's commercial program page directly. Mass Save rebate levels and program eligibility change annually, and amounts are often higher for projects completed early in the program year before budgets are exhausted. Your state energy office (Massachusetts Clean Energy Center) maintains a current list of active commercial efficiency programs.