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 7-year parts / 2-year 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 7-year parts / 2-year labor warranty since the acquisition.
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.