Heat Pump vs. Gas Storage Water Heater
This is a closer fight than heat pump versus electric resistance, since gas is often cheaper per unit of energy than electricity. Whether the heat pump's efficiency advantage overcomes that rate gap depends on your specific electricity and gas rates.
At your inputs, the heat pump water heater costs $200 less over 10 years.
| Heat pump water heater total cost over the horizon | $4,400 |
|---|---|
| Gas storage water heater total cost over the horizon | $4,600 |
Breakeven: The higher upfront cost is offset by year 8.5, after which the heat pump water heater stays cheaper.
- This uses planning estimates you entered, not a contractor quote or guaranteed savings.
- A lower calculated cost does not measure recovery speed, venting requirements, or space needs; weigh those separately.
What this also tells you: If your annual costs are 20% higher or lower than entered, the recommendation could flip: it ranges from $60 favoring the gas water heater to $460 favoring the heat pump water heater.
This is a planning estimate based on your entries. It does not size equipment, determine electrical or building-code compliance, verify incentive eligibility, or replace a contractor quote or professional energy audit.
Why this decision comes up
Homeowners electrifying appliance by appliance often reach the water heater and want to know whether a heat pump unit genuinely beats a gas replacement on cost, not just on electrification principle.
How this is calculated
Both paths are compared as total cost over your ownership horizon: net cost plus annual energy cost carried forward.
A worked example
With the defaults (heat pump: $2,200 net cost, $220/year; gas: $1,100 net cost, $350/year; 10-year horizon), the heat pump totals $4,400 against $4,600 for gas, a modest $200 advantage for the heat pump at these defaults, a close enough margin that your actual rates could easily flip the result.
Common mistakes
A common mistake is assuming a heat pump automatically wins against gas the way it does against electric resistance. Check your actual rates rather than assuming the electrification direction always wins on cost.
Limitations
This does not include any savings from removing gas service entirely if this is your last gas appliance. See the gas service removal payback tool to add that separately.
Common questions
Why is this comparison closer than heat pump vs. electric resistance?
Gas is often priced lower per unit of delivered heat than electricity, which narrows the gap that a heat pump's efficiency advantage needs to close, unlike the electric resistance comparison where the heat pump wins more decisively.
Does this account for removing gas service if this is my last gas appliance?
No, this compares the two units' own costs only. If switching would let you remove gas service entirely, see the gas service removal payback tool to add that savings separately.
What if my gas rate is unusually low or high?
Enter your own actual annual cost figures for each option, since the standard defaults reflect typical but not universal rates.
Does this assume I already have gas service, or would need to add it?
Enter your gas option's installed cost reflecting your actual situation. If you would need a new gas line, include that real cost, which can meaningfully change this comparison's outcome.
Is there a rebate specifically for choosing heat pump over gas?
Some utilities offer larger rebates for heat pump water heaters as part of electrification incentive programs. Confirm your specific program's amount rather than assuming a generic rebate applies.