Energy Efficient Water Heaters: Massachusetts Rebates and Incentives 2026
7 min read
The Massachusetts water heater rebate landscape has changed significantly heading into 2026. The biggest shifts: Mass Save has discontinued all rebates for fossil fuel equipment (gas, oil, and propane water heaters), the federal Section 25C tax credit has expired, and heat pump water heaters are now the clear focus of available incentive programs. Here's everything you need to know about what's available in 2026.
What Changed for 2026
Before diving into current programs, here are the major changes Massachusetts homeowners should know about:
Mass Save fossil fuel rebates eliminated: In alignment with the commonwealth's climate policy and the 2021 Climate Act mandate, Mass Save no longer offers rebates, incentives, or financing for equipment powered by natural gas, oil, or propane. This means rebates for gas storage water heaters and gas tankless water heaters are no longer available.
Federal Section 25C tax credit expired: The Energy Efficient Home Improvement Tax Credit (Section 25C), which provided up to $2,000 for qualifying heat pump water heaters, expired on December 31, 2025 under the One Big Beautiful Bill Act (OBBBA) signed into law in 2025. Installations made after that date are not eligible.
Federal Section 25D tax credit expired: The Residential Clean Energy Credit (Section 25D), which covered solar water heaters and geothermal systems, also expired for expenditures made after December 31, 2025.
New refrigerant requirements: Heat pump models using R410A refrigerant (GWP over 700) are no longer eligible for Mass Save rebates, per updated EPA regulations.
Mass Save Rebates for 2026
Mass Save remains the primary rebate program for Massachusetts homeowners, but the focus is now exclusively on electric heat pump water heaters.
Heat Pump Water Heaters
Standard Heat Pump Water Heaters
Rebate amount: $750 per unit
Efficiency requirement: ENERGY STAR certified, UEF 3.30 or higher
Must be installed by a licensed plumber between January 1, 2026 and December 31, 2026
Limit one rebate per gas or electric account
Replaces existing electric, propane, natural gas, or oil water heater
120-Volt / 15-Amp Heat Pump Water Heaters
Rebate amount: $750 per unit
Efficiency requirement: ENERGY STAR certified, UEF 2.20 or higher
Same installation and eligibility rules apply
Designed for easier installation without electrical panel upgrades
Split-System Heat Pump Water Heaters
Rebate amount: $1,500 per system
Efficiency requirement: ENERGY STAR certified, UEF 2.20 or higher
Same installation and eligibility rules apply
Ideal for homes where space or air temperature is a constraint
How to Get the Rebate
Mass Save offers three ways to receive an instant rebate on qualifying heat pump water heaters:
Participating distributors: Your contractor purchases from an approved distributor and the rebate is applied at the point of sale
Participating retailers: Present your utility account information at checkout for an instant discount
Mass Save Online Marketplace: Purchase directly through the Mass Save website with the rebate applied automatically
Why Heat Pump Water Heaters
Up to 3x more efficient than conventional electric water heaters
Saves $300+ annually on electric bills
Qualifies for the highest available rebate
Dehumidifies surrounding area as a bonus
Lifespan of 10-15 years
What About Gas Water Heaters?
If you currently have a gas water heater and need a replacement, gas storage tanks and gas tankless units are still available for purchase and installation. They remain a practical choice for many Boston homes, especially where gas infrastructure is already in place. However, there are no longer any Mass Save rebates or financing incentives for gas-powered water heating equipment.
Gas tankless water heaters still offer significant advantages including endless hot water, a 20+ year lifespan, and energy savings of 24-34% compared to standard tank heaters. They simply no longer carry rebate incentives.
Federal Tax Credits: What Expired
The two major federal tax credits for water heaters both expired at the end of 2025:
Section 25C (Energy Efficient Home Improvement Credit)
Previously provided 30% of cost up to $2,000 for heat pump water heaters
Expired for property placed in service after December 31, 2025
Terminated early by the One Big Beautiful Bill Act (OBBBA)
If you installed a qualifying unit in 2025, you can still claim the credit on your 2025 tax return using IRS Form 5695
Section 25D (Residential Clean Energy Credit)
Previously provided 30% credit for solar water heaters and geothermal systems
Also expired for expenditures made after December 31, 2025
Was originally set to run through 2034 before OBBBA accelerated the termination
Bottom line for 2026: There are currently no federal tax credits available for residential water heater installations.
Municipal and Local Programs
Some Boston-area communities may offer additional local incentives. Programs vary by municipality and change frequently, so contact your local government directly:
Cambridge: The Cambridge Energy Alliance partners with Mass Save to help residents access incentives. Income-eligible residents may qualify for enhanced rebates through Mass Save's income-eligible programs, which can cover up to 100% of costs.
Brookline: Tiered incentives may be available based on household income through Mass Save's moderate-income and income-eligible tiers.
Municipal electric utilities: If you receive electricity from a municipal utility (such as Concord, Wellesley, or Peabody), separate rebate programs may apply. For example, Peabody Municipal Light Plant offers a $500 rebate for heat pump water heaters through the NEXT ZERO program.
Always check directly with your municipality and utility provider for the most current programs.
Utility Company Programs Through Mass Save
Eversource and National Grid participate as Sponsors of Mass Save, meaning their rebates are delivered through the Mass Save program described above. Key offerings:
Free Home Energy Assessments
Available through Mass Save for all residential customers of participating utilities
Identifies efficiency opportunities throughout your home
Required before accessing HEAT Loan financing
Includes recommendations for water heating upgrades
ConnectedSolutions / Demand Response
Eversource and National Grid offer incentives for participating in demand response programs
Heat pump water heaters with smart controls may qualify for additional seasonal incentives
How to Qualify for Rebates in 2026
Step 1: Verify Eligibility
Before purchasing:
Confirm your utility provider is a Mass Save sponsor (Eversource, National Grid, Berkshire Gas, Liberty Utilities, Unitil, or Cape Light Compact)
Verify the equipment is ENERGY STAR certified and meets UEF requirements (3.30 for standard, 2.20 for 120V and split-system)
Ensure the model is on the Mass Save Qualified Products List and does not use R410A refrigerant
Step 2: Choose Your Rebate Path
Select one of three options:
Purchase through a participating distributor (contractor handles this)
Buy at a participating retailer with instant rebate
Order from the Mass Save Online Marketplace
Step 3: Professional Installation
Critical requirements:
Licensed Massachusetts plumber
Proper permits obtained
Code-compliant installation
Required inspections completed
Installation must occur between January 1, 2026 and December 31, 2026
Important: DIY installations void rebates and warranties.
Step 4: Submit Rebate Application (If Not Instant)
Required documentation:
Completed rebate form
Purchase receipt/invoice
Model and serial numbers
Proof of ENERGY STAR certification
Installation date
Contractor license number
Processing time: Typically 4-8 weeks for mail-in rebates.
Choosing the Right Efficient Water Heater
Heat Pump Water Heaters (Best for Rebates)
Best for:
Homes looking to maximize rebates and long-term savings
All-electric homes or those transitioning away from fossil fuels
Basements and utility rooms with adequate space (1,000+ cubic feet)
Ambient temperatures between 40-90°F
Considerations:
Makes some noise (comparable to a refrigerator)
May cool surrounding area slightly
Best efficiency in unconditioned spaces like Boston basements
120-Volt Heat Pump Water Heaters
Best for:
Homes without 240V circuits near the water heater location
Simpler installation without electrical panel upgrades
Replacement of existing standard electric water heaters
Split-System Heat Pump Water Heaters
Best for:
Homes with limited space around the water heater
Situations where the heat pump unit needs to be separated from the storage tank
Qualifies for the highest rebate at $1,500
Gas Tankless Water Heaters (No Rebate)
Still a strong option for:
Homes with existing natural gas infrastructure
High hot water demand households
Space-constrained locations
Long-term homeowners (20+ year lifespan)
Massachusetts-Specific Requirements
Energy Code Compliance
Massachusetts requires all new water heater installations meet:
Minimum efficiency standards
Proper insulation
Expansion tank installation on closed systems
Temperature-pressure relief valve
Proper venting (gas units)
Installation Standards
Required elements:
Licensed plumber installation
Building permit
Electrical or gas permits (if applicable)
Final inspection
Certificate of compliance
Financing Options
Mass Save HEAT Loan
The HEAT Loan remains available for 2026 and is one of the best financing tools for Massachusetts homeowners:
Terms:
0% interest financing
Up to $25,000
Terms up to 7 years
Covers equipment and installation
Can be combined with Mass Save rebates
Approval through participating lenders
Eligibility:
Massachusetts residential property
Must complete a Mass Save Home Energy Assessment first
Owner-occupied or landlord properties
Subject to lender approval
How to apply:
1. Schedule a no-cost Mass Save Home Energy Assessment
2. Receive your HEAT Loan Authorization Form after the assessment
3. Apply at a participating lender with the authorization form
Utility On-Bill Financing
Some utilities offer on-bill repayment options for qualified efficiency upgrades. Check with your specific utility provider for current availability.
2026 Program Summary
Currently available in 2026:
Mass Save heat pump water heater rebates: $750 (standard/120V) or $1,500 (split-system)
Mass Save HEAT Loan: 0% interest up to $25,000
Free home energy assessments
Income-eligible enhanced incentives (up to 100% of costs for qualifying households)
No longer available in 2026:
Mass Save gas storage water heater rebates (discontinued)
Mass Save gas tankless water heater rebates (discontinued)
Federal Section 25C tax credit (expired December 31, 2025)
Federal Section 25D tax credit (expired December 31, 2025)
Check regularly:
Program funding levels can change
New state or federal legislation could introduce new incentives
Municipal programs may launch or update throughout the year
Getting Started
Step-by-Step Process
1. Assess your needs: Hot water usage, space, current fuel type, budget
2. Schedule a free energy assessment: Through Mass Save, required for HEAT Loan
3. Research equipment: Check the Mass Save Qualified Products List
4. Get quotes: Compare contractors and pricing
5. Choose your rebate path: Distributor, retailer, or online marketplace
6. Schedule installation: Licensed, insured professional, before December 31, 2026
7. Submit rebate application: If not using instant rebate option
8. Apply for HEAT Loan: If financing is needed, through a participating lender
Professional Consultation
Not sure which water heater is right for your home? A professional assessment can help you:
Determine optimal water heater type and size
Calculate potential savings
Navigate available rebates and financing
Ensure proper installation
Handle all paperwork
Contact Boston Tank Swap at (617) 849-9929 for a free consultation on energy-efficient water heaters and available rebates. We help homeowners throughout Newton and Greater Boston choose the right system and maximize their savings.
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