Quick answer: Intex doesn’t sell its own heat pump — its only in-house heating product is the 28685E Solar Mat (~$29.99 per panel, +5-9°F on sunny days). For real heating power, the FibroPool FH255 heat pump (55,000 BTU, ~$1,799) paired with a $19.95 Intex-to-1.5” adapter kit is the best overall setup for most Intex Ultra Frame and Easy Set pools up to 10,000 gallons. If you just want a cheap boost on top of your existing setup, two or three Intex Solar Mats are the lowest-cost way to get there.
Intex Easy Set, Ultra Frame, and Prism Frame pools use narrower 1.25” or 1.5” hose fittings than a standard in-ground plumbing setup, which is why most heater listings don’t mention Intex compatibility directly — the heater itself works fine, you just need the right adapter to connect it. This guide covers the real options, in order of heating power, plus the hose-fitting fix each one needs. If you’re comparing heater types more broadly first, see our best above-ground pool heater roundup.
Best pool heaters for Intex pools at a glance
| Heater | Type | Best for | Price | Rating |
|---|---|---|---|---|
| FibroPool FH255 + adapter kit | Heat pump | Best overall / continuous heat | ~$1,799 + $19.95 | ★★★★★ |
| Intex 28685E Solar Mat | Solar | Official Intex, lowest cost | ~$29.99/panel | ★★★★☆ |
| EcoSmart Smart Spa 11 + adapter | Electric | Small pools, fast heat | ~$499 + $19.95 | ★★★☆☆ |
1. FibroPool FH255 + Intex Adapter Kit — Best Overall
FibroPool FH255 (55,000 BTU) + Intex-Compatible Adapter Kit
- 55,000 BTU — enough continuous heat to hold temperature through a cool week, not just a sunny afternoon.
- The $19.95 adapter kit converts FibroPool's standard 1.5" union to Intex's narrower 1.25" hose fitting — no cutting or gluing.
- Sized right for Intex Ultra Frame and Easy Set pools up to about 10,000 gallons.
- Highest upfront cost of the three options here, and needs a level pad next to the pool.
Because Intex doesn’t build its own heat pump, most Intex owners who want real heating power buy a standard heat pump like the FH255 and connect it with an inline adapter kit instead of hard plumbing. It’s the same install either way — hose in, hose out — the adapter just matches the 1.5” heater fitting to Intex’s 1.25” hose. Once it’s running, a heat pump like this holds a set temperature overnight and through cloudy stretches, which neither a solar mat nor an electric heater can do at this price. Want it running before the weekend? Try Amazon Prime free for 30 days and get two-day delivery on both the heater and the adapter kit.
2. Intex 28685E Solar Mat — Official Intex, Lowest Cost
Intex 28685E Solar Mat (47.25" x 47.25")
- Rated for pools up to 8,000 gallons; adds roughly 5-9°F on a sunny day per the manufacturer's spec.
- Ships with the 1.25" hose attachment and adapters already sized for Intex pumps — no separate adapter kit needed.
- Needs a filter pump under 2,000 GPH; most Intex cartridge pumps qualify.
- Only works while the sun is out and does nothing on overcast days — a booster, not a primary heater.
This is the only heating product Intex sells directly, and at under $30 a panel it’s the cheapest way to add any heat at all. One panel makes a modest difference; most owners run two or three in series for a noticeable bump on a sunny week. Since it’s a bypass-valve add-on rather than a full heater, it also pairs well with either option above — run the solar mat during the day and let a heat pump or electric heater carry the evening.
3. EcoSmart Smart Spa 11 + Adapter — Best for Small Pools & Fast Heat
EcoSmart Smart Spa 11 (11.8kW) + Adapter Kit
- Self-modulating 11.8kW element puts out roughly 40,000 BTU with no compressor and no gas line.
- Cheapest way to get a full-size heater running on an Intex pool — same $19.95-style 1.25"-to-1.5" adapter as the FH255.
- Best suited to smaller Easy Set pools or as a fast top-up alongside a solar mat.
- Costs more per hour to run than a heat pump; see our [electric pool heater running-cost guide](/best/best-electric-pool-heater/) before committing to daily use.
If your Intex pool is on the smaller side or you mostly want fast heat for weekend swims rather than a heater running all season, the Smart Spa 11 is the cheapest full-size heater that will actually work with the same adapter approach as the heat pump above. Just budget for the electric bill — a resistance heater like this costs several times more per BTU to run than a heat pump.
How to match a heater to your Intex pool
- Check your pump’s GPH first — a heater or solar mat rated above your filter pump’s flow (usually 1,000-3,000 GPH on Intex models) won’t heat effectively even if it’s the right BTU size.
- Confirm your hose size — measure before buying an adapter kit; Easy Set pools are usually 1.25”, larger Ultra Frame and Prism Frame models are often 1.5”.
- Stack solar with a heater, not instead of one — a solar mat is a free daytime boost, not a replacement for continuous heat on a heat pump or electric unit.
- Budget for the adapter — it’s a small line item ($20 or so) but skipping it means the heater simply won’t connect to Intex’s stock hoses.
The bottom line
For most Intex Ultra Frame and Easy Set pools, the FibroPool FH255 with a $19.95 adapter kit delivers real, continuous heat for less total cost than most Intex owners expect once they realize Intex itself doesn’t sell a heat pump. Add an Intex 28685E Solar Mat for a free daytime boost, or drop to the EcoSmart Smart Spa 11 if your pool is smaller and you only need occasional fast heat. If your pool lands right around 10,000 gallons and you’re weighing this against a heavier-duty in-ground heater, see our best pool heater for a 10,000-gallon pool comparison. For a deeper look at heat pumps generally, see our best pool heat pump guide.