Gulfstream built a name as a budget-friendly alternative to AquaCal, and the brand has since been folded into Pentair — its HE-RA heat pumps are now sold and warrantied directly through Pentair’s own site. Here’s how the HE110-RA, HE125-RA, and HE150-RA compare so you can size the right one for your pool.
Quick answer
The Gulfstream HE125-RA (118,000–125,000 BTU, 6.0 COP per Pentair’s spec sheet) is the best overall pick for a typical 15,000–20,000-gallon in-ground pool, balancing price against running cost. Budget-conscious owners with a smaller pool can drop to the HE110-RA (110,000–115,000 BTU, 6.1 COP) and save a few hundred dollars, while pools over 20,000 gallons should size up to the HE150-RA (138,000–142,000 BTU, 6.0 COP) for a faster heat-up. All three now ship under Pentair’s standard 2-year parts-and-labor warranty, since Gulfstream is no longer an independently sold brand.
Gulfstream heat pumps at a glance
| Model | BTU | COP | Best for | Price |
|---|---|---|---|---|
| Gulfstream HE110-RA | 110,000–115,000 | 6.1 | Best budget pick | ~$3,900 |
| Gulfstream HE125-RA | 118,000–125,000 | 6.0 | Best overall | ~$4,100 |
| Gulfstream HE150-RA | 138,000–142,000 | 6.0 | Large pools | ~$3,650–$4,500 |
1. Gulfstream HE125-RA — Best Overall
Gulfstream HE125-RA Heat Pump (118,000–125,000 BTU)
- Rated 6.0 COP by Pentair's own spec sheet, meaning roughly $1 of electricity returns $6 of heat.
- Sized right for the 15,000–20,000-gallon range most in-ground residential pools fall into.
- Digital control panel with a straightforward temperature dial — plainer than Hayward's or Pentair's own app-connected units, but simple to service.
- Backed by Pentair's standard 2-year parts-and-labor warranty since the acquisition (per Pentair's current warranty page).
The HE125-RA lands in the sweet spot for most residential in-ground pools: enough BTU to heat a 15,000–20,000-gallon pool in a reasonable window, at a COP that keeps the electric bill down without paying AquaCal or Hayward HeatPro pricing for it. Warm up your pool sooner — try Amazon Prime free for 30 days and get your pool heater delivered in two days.
2. Gulfstream HE110-RA — Best Budget Pick
Gulfstream HE110-RA Heat Pump (110,000–115,000 BTU)
- Slightly higher rated COP (6.1) than the larger HE125 and HE150 models, per Pentair's spec table.
- Right-sized for smaller in-ground pools and larger above-ground pools rather than anything over ~18,000 gallons.
- Several hundred dollars cheaper than the HE125-RA for a modest BTU tradeoff.
If your pool is on the smaller side, the HE110-RA gets you the same 6-COP-class efficiency as the bigger models for less money — there’s no real efficiency penalty for downsizing here, just a slower heat-up on a larger pool.
3. Gulfstream HE150-RA — Best for Large Pools
Gulfstream HE150-RA Heat Pump (138,000–142,000 BTU)
- Highest BTU output in the lineup — best fit for pools over 20,000 gallons or anyone heating on a tight schedule.
- Also sold in a heat/cool (HE150-TA) version for climates where nighttime cooling matters.
- Street price varies more than the smaller models depending on retailer promotions — shop around before buying.
For a large in-ground pool, undersizing a heat pump just means longer heat-up times every time the water cools off overnight. The HE150-RA’s extra BTU heads that off, at a COP that matches the smaller models — you’re not trading efficiency for capacity here.
Gulfstream is now a Pentair product line
Gulfstream used to be sold as an independent budget brand; today, Pentair lists the full HE-RA lineup directly on its own site and backs it with Pentair’s standard warranty terms. That’s good news for support and parts availability — a Pentair dealer network is far larger than most standalone heat-pump brands — but it also means Gulfstream no longer competes on price quite as sharply as it once did against true budget options. For a side-by-side against Pentair’s own premium heat pump, see our Hayward vs. Pentair comparison; for Pentair’s flagship gas heater lineup, see best Pentair MasterTemp pool heater.
How to size a Gulfstream heat pump
Use roughly 5 BTU per gallon as a starting point: a 20,000-gallon pool wants at least 100,000 BTU, which makes the HE110-RA a minimum and the HE125-RA a safer margin. Add 10–20% if you’re in a cooler climate or want a faster recovery after a cold night. As with any heat pump, a vented pool heater cover protects the cabinet without blocking the airflow the compressor needs, and keeping the evaporator coil clear is the single biggest factor in avoiding a “won’t heat” service call — see our maintenance guide for the routine.
The bottom line
The Gulfstream HE125-RA is the best all-around buy for a typical residential pool — a 6.0 COP at a price that undercuts AquaCal and Hayward HeatPro at the same BTU class. Step down to the HE110-RA to save money on a smaller pool, or up to the HE150-RA for faster heat-up on a large one. All three now carry Pentair’s warranty and dealer support, so the old “budget brand” risk that came with buying Gulfstream a few years ago is largely gone. For the full picture of how the HE110-RA and HE125-RA stack up against picks for other pool sizes, see our best inground pool heater by gallon count guide. Curious how Gulfstream’s warranty and price tier stack up against every other brand on the site? See our pool heater brands compared guide. If an HE-RA unit’s compressor hums but won’t spin up, our capacitor replacement guide has the exact AquaCal OEM part before you assume the compressor needs full replacement.