A heat pump water heater (HPWH) is far more efficient than a gas tank because it moves heat with electricity instead of burning fuel — typically using a fraction of the energy. For most homes replacing an aging gas tank, it's the better long-term choice. Two honest scope notes up front: Plum installs heat pump water heaters only, and we don't repair or service water heaters.
What Plum does: install heat pump water heaters — most often replacing a gas water heater. What Plum doesn't do: tank, tankless, or solar water heaters, or water-heater repair/service. We keep our scope honest to our license and expertise.
How do the two differ?
A gas tank water heater burns gas under a stored tank of water. A heat pump water heater pulls heat from the surrounding air to warm the water — like a refrigerator in reverse — which is why it's so efficient. HPWHs need adequate space and airflow (a garage or utility area is common) and have a slightly different recovery rhythm, which good sizing handles.
Side-by-side comparison
| Factor | Heat Pump Water Heater | Gas Tank |
|---|---|---|
| Energy efficiency | Very high (heat moved) | Lower (combustion) |
| Emissions | All-electric | Burns gas |
| Placement needs | Space + airflow | Flexible, needs venting |
| Rebate direction (2026) | May qualify (CCA/utility/SGIP) | Not incentivized |
| Plum installs it? | Yes — our specialty | No |
When is an HPWH the right move?
- Your gas water heater is aging or failing and you want to electrify.
- You have adequate space and airflow for the unit.
- You want the most efficient hot water and lower long-term operating cost.
Where HPWH installs go wrong
Undersizing for a busy household, or placing the unit somewhere with too little air volume, are the usual missteps. Comparing quotes? A free second opinion checks sizing and placement, not just price.
Why HPWH is a Plum specialty
Replacing a gas water heater with a heat pump water heater is one of our core electrification jobs. We size and place it correctly, handle the permit, and keep the work clean — and Sam, the owner, quotes it honestly. For incentive timing, see the Rebate Hub; to spread the cost, Wisetack financing is always available.
ActionYour next step
Thinking about replacing a gas water heater? Book a no-pressure in-home assessment for a heat pump water heater — honest pricing, install only.
Educational comparison; efficiency and sizing depend on your home and household demand. Plum HVAC installs heat pump water heaters only (no tank, tankless, solar, or water-heater repair). CSLB #1087978 · Mitsubishi Electric Elite Diamond Contractor.
Educational guidance for Mountain View & Peninsula homeowners — not a formal quote. Every recommendation should be confirmed against your home's actual conditions during an in-home visit. Incentive amounts and program status change; verify current eligibility before you buy.
Quick answers
Is a heat pump water heater better than a gas tank?
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For efficiency and emissions, yes — a heat pump water heater (HPWH) uses electricity to move heat and is several times more efficient than a gas tank. It needs adequate space and airflow and has a slightly different recovery pattern, but for most homes replacing an aging gas tank it's the better long-term choice.
Does Plum HVAC repair water heaters or install tankless?
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No. Plum installs heat pump water heaters only — we don't install tank, tankless, or solar water heaters, and we don't repair or service water heaters. Our most common water-heater job is replacing a gas water heater with an efficient heat pump water heater.
Are there rebates for a heat pump water heater in 2026?
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Possibly. Federal HEEHRA is waitlisted in 2026, but some local utility/Clean Energy programs and SGIP (for qualifying installations) may apply to a heat pump water heater. We track current status on our Rebate Hub and file the paperwork for you.