Pool Heater Cost (2026)
Updated October 2026
A pool heater is two costs, not one: the installed price (unit + labor + plumbing + permit) and the monthly fuel bill for every month you heat. Gas is cheapest to install at about $1,500–$5,000 and most expensive to run; heat pumps flip that at $3,000–$8,000 installed and roughly $50–$150/month. Pick by how you swim.
Cost by heater type (installed)
| Heater type | Installed total | Unit only | Monthly to run | Best for |
|---|---|---|---|---|
| Natural gas | $1,500–$5,000 | $1,200–$3,500 | $150–$400 | Any climate; fast heat-ups, weekend/on-demand use |
| Propane | $1,800–$5,500 | $1,200–$3,500 | $300–$600 | Rural properties with no gas service |
| Electric heat pump | $3,000–$8,000 | $2,000–$5,500 | $50–$150 | Warm climates; keeping a steady temperature all season |
| Electric resistance | $1,000–$2,500 | $500–$1,200 | $175–$500 | Small spas and above-ground pools only |
| Solar | $800–$2,500 | $600–$1,800 | $0–$15 | Sun-belt climates (FL, AZ, CA, TX) |
Source: CostToRenovate 2026 pool heater guide, retrieved October 30, 2026. Installed figures assume unit, labor, basic plumbing connections and permit with an existing gas line or 240V circuit at the equipment pad. Monthly operating figures are per the same source (heat-pump cross-checked against VarmInPool, retrieved October 30, 2026: $50–$150 typical, $100–$300 when uncovered or in cold weather).
Installed cost by pool size
| Pool size | BTU needed | Gas, installed | Heat pump, installed | Solar, installed |
|---|---|---|---|---|
| 10,000 gallons | 100,000-200,000 | $1,500–$3,200 | $3,000–$4,800 | $800–$1,800 |
| 15,000 gallons | 200,000-300,000 | $2,000–$3,800 | $3,500–$5,500 | $1,200–$2,200 |
| 20,000 gallons | 300,000-400,000 | $2,500–$4,500 | $4,500–$6,500 | $1,800–$2,800 |
| 25,000 gallons | 350,000-450,000 | $3,000–$5,000 | $5,500–$7,500 | $2,200–$3,500 |
| 30,000 gallons | 400,000-500,000+ | $3,500–$6,000 | $6,500–$9,000 | $2,800–$4,500 |
Source: CostToRenovate 2026 pool heater guide, retrieved October 30, 2026. Undersizing is the classic mistake — ask for a written BTU calculation based on pool volume, surface area and your target temperature before signing.
A heated backyard pool in season. Photo: Marc Ryckaert (MJJR), Wikimedia Commons, CC BY 3.0.
The monthly bill is the real decision
Over a heater's life, operating cost dwarfs the install price. The efficiency gap is mechanical: heat pumps carry a coefficient of performance of roughly 5–7 (they move 5–7 units of heat per unit of electricity), while gas heaters convert only about 80–90% of their fuel into water heat (CostToRenovate 2026; VarmInPool, both retrieved October 30, 2026). A 100,000 BTU heat pump draws about 5 kWh per running hour — roughly $0.75/hour at $0.15/kWh (VarmInPool).
- Heat pump strategy: run it daily to hold temperature. Slow to heat (24–72 hours from cold), inefficient below about 50°F air.
- Gas strategy: heat on demand for weekends and spas — fast (1–2°F/hour) regardless of weather, at $150–$400/month while in use (propane $300–$600+).
- Pool cover: the single biggest lever. Evaporation wastes most pool heat; a cover cuts heating energy roughly in half or better (VarmInPool reports 50–90% savings with cover use).
First-time install adders
Replacing an existing heater is the cheap path. If the pad has no utility stub-out yet, budget $500–$1,500 for a new gas line or 240V electrical circuit (CostToRenovate 2026 guide, retrieved October 30, 2026) — the most common reason quotes grow after signing.
Where this fits in the pool budget
Heating is one slice of owning a pool. Build cost lives on the how much a pool costs guide, with a size-based estimate in the pool cost calculator. Refreshing the surround instead? See pool deck resurfacing cost or the pools hub.
FAQs
How much does it cost to install a pool heater?
Most homeowners land between roughly $1,500 and $8,000 installed depending on fuel type: gas heaters run about $1,500–$5,000 installed and electric heat pumps about $3,000–$8,000 (CostToRenovate 2026 guide, retrieved October 30, 2026). If the equipment pad has no gas line or 240V circuit yet, budget an extra $500–$1,500 for the utility connection.
How much does a pool heater cost per month to run?
Heat pumps are the cheapest to run at about $50–$150/month in typical use (up to $100–$300/month uncovered or in colder weather); gas runs about $150–$400/month, propane $300–$600/month, and resistance heaters $175–$500/month (CostToRenovate 2026; VarmInPool, both retrieved October 30, 2026).
Is a pool heat pump worth the extra upfront cost?
Often, if you heat the pool most days in a mild climate. Heat pumps move heat rather than making it (a COP of roughly 3–7 per VarmInPool), so their monthly cost is a fraction of gas — one source puts the annual saving vs gas or resistance heating at $950–$4,800. Gas wins for fast, occasional heat-ups and cold climates.
Sources
- CostToRenovate — Pool Heater Cost in 2026: Gas vs. Heat Pump vs. Solar — retrieved 2026-10-30.
- VarmInPool — How Much Does It Cost to Run a Pool Heat Pump? — retrieved 2026-10-30.
Publisher bands are kept separate and never averaged. Angi and HomeGuide were not fetched directly this pass and are not cited. Estimate only — get local written quotes.