Tank Water Heaters: The Standard
Most familiar water heater type — insulated tank holds 40-80 gallons heated by gas burner OR electric resistance element.
Gas Tank (Most Common in MA)
Cost $1,800-$3,200 installed. Lifespan 10-15 years. Operating cost $480-$680/year. Recovery rate ~40 GPH (gallons per hour). Brands: Bradford White, Rheem, AO Smith. Best for: gas-heated homes, moderate hot water demand.
Electric Tank
Cost $1,400-$2,400 installed. Lifespan 12-18 years. Operating cost $620-$840/year (highest). Brands: Rheem, AO Smith, Bradford White. Best for: gas-unavailable homes (rare in MA). Often replaced by HPWH.
Oil Tank
Cost $2,800-$4,200 installed. Lifespan 12-18 years. Operating cost $880-$1,200/year. Best for: oil-heated homes wanting integrated system. Rapidly being phased out as oil heating retreats.
Tankless Water Heaters: On-Demand
No tank. Heats water as it flows through a heat exchanger. Endless hot water, smaller footprint, longer lifespan.
Gas Tankless
Cost $3,400-$5,800 installed (premium for venting + gas line + dedicated electric for controls). Lifespan 18-22 years. Operating cost $360-$520/year. Brands: Navien (best-selling MA), Rinnai, Bosch. Best for: high hot water demand, gas-heated homes, long ownership horizon.
Electric Tankless
Cost $1,800-$3,200 installed. Lifespan 12-18 years. Operating cost $720-$960/year (high). Requires substantial 240V circuit (60-80A). Best for: small homes with low simultaneous hot water draw. Rarely justified in MA — HPWH wins.
Heat Pump Water Heater: The MA Default
Tank water heater with built-in heat pump that extracts heat from surrounding air. 65-78% lower energy use than electric resistance tank. Mass Save rebate makes net install cost competitive with gas tank.
Performance + Cost
Cost $2,500-$4,500 installed. Lifespan 12-15 years. Operating cost $180-$340/year. COP 2.5-3.5 vs 1.0 for resistance.
Brands
- Rheem ProTerra — best-selling, $2,200-$3,400
- Bradford White Aerotherm — premium, $2,800-$4,200
- AO Smith Voltex — mid-tier, $2,400-$3,800
Install Requirements
Conditioned basement OR mechanical room with 1,000+ cubic feet of air. Drainage for condensate. Dedicated 30A 240V circuit. Pro Build's standard install includes all 3 plus condensate pump if floor drain unavailable.
Mass Save Rebate
$750-$1,500 standard tier; up to $2,250 income-eligible enhanced. Makes HPWH net cost competitive with gas tank.
Decision Matrix
Pro Build's recommendation by household + existing fuel:
| Existing fuel | 2-3 person household | 4-6 person household |
|---|---|---|
| Gas (existing) | HPWH (Mass Save rebate flips economics) | HPWH or gas tankless |
| Oil (replacing) | HPWH (always wins) | HPWH |
| Electric resistance (replacing) | HPWH (always wins) | HPWH |
| Propane (replacing) | HPWH (always wins) | HPWH |
| Gas (heat pump-electrified house) | HPWH | HPWH |
The default 2026 recommendation in MA: HPWH unless gas tankless specifically pencils for very high simultaneous hot water demand (3+ bathrooms running simultaneously).
Frequently Asked Questions
Can a HPWH heat enough water for a 5-person family in MA?
Does a HPWH cool the basement in winter?
Will a HPWH work in an unconditioned crawl space?
What's the lifespan difference between HPWH and gas tank?
Can I install a HPWH myself?
How loud is a HPWH?
References & Sources
- ENERGY STAR Heat Pump Water Heater Buying Guide. https://www.energystar.gov/products/water_heaters/heat_pump_water_heaters
- Mass Save HPWH rebate program. https://www.masssave.com/saving/residential-rebates
- Rheem ProTerra specifications. https://www.rheem.com/products/water_heaters/
