Hayward HeatPro Review: HP21405T, HP50HA & HP50TA Explained (2026)

Quick answer

Hayward’s HeatPro heat-pump line splits into two tiers that each hide a naming trap. On the in-ground side, the current 140,000 BTU HP21405T replaced the discontinued HP21404T — same BTU output and roughly the same ~$6,999 price, but a titanium microchannel (MCHX) coil that Hayward’s own literature says cuts unit weight by up to 50 lb and improves thermal performance, with a COP of about 5.7 under AHRI 1160 testing. On the above-ground side, the HP50HA and HP50TA are both 50,000 BTU units for pools up to about 13,000 gallons, but the HP50HA adds a cooling mode, 1-1/2 inch ports, and a screen lock that the HP50TA simply doesn’t have — and the HP50TA often lists for more money anyway, so the near-identical model numbers tell you almost nothing about which one actually fits your pool.

HeatPro isn’t one heater — it’s two tiers with their own naming gotchas

HeatPro shows up across dozens of comparisons on this site as Hayward’s answer to Raypak’s and Pentair’s heat pumps, but it’s never gotten its own dedicated breakdown — which matters, because “HeatPro” on a retailer listing could mean a $7,000 in-ground unit or a $2,000-ish above-ground one, and within each tier the specific model number encodes real differences most buyers skim past.

HP21405T: the current in-ground flagship

The HP21405T is Hayward’s 140,000 BTU in-ground HeatPro, and it’s the model our best Hayward pool heater guide already picks as the brand’s lowest-running-cost option. What’s worth spelling out on its own: this unit replaced the older HP21404T, and the swap wasn’t just a cosmetic model-number bump. Hayward’s own HeatPro MCHX series materials credit the switch from a tube-and-fin evaporator to a microchannel (MCHX) coil with cutting the unit’s weight by up to 50 lb and improving heat-transfer performance, while keeping the same 140,000 BTU rating. Tested under AHRI 1160 standard conditions, the HP21405T posts a COP around 5.7 — meaning roughly $1 of electricity input returns about $5.70 worth of heat output, according to Hayward’s own spec sheet for the model.

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Because the HP21404T is no longer in current production, any listing you find for it is working through remaining retailer stock rather than offering a cheaper alternative to the HP21405T — the two aren’t a budget-vs-premium choice, just old-generation-vs-current.

HP50HA vs. HP50TA: the compact line’s real trap

The in-ground HP21404T/HP21405T story is at least documented elsewhere on Hayward’s site. The above-ground HP50HA and HP50TA get far less attention, and the naming is arguably more misleading: both are 50,000 BTU heat pumps rated for pools up to roughly 13,000 gallons, which covers most above-ground and small in-ground pools, but the two models differ on four real specs:

The cooling-mode difference is the one that actually changes what the heater can do for you: the HP50HA can pull heat out of the water to lower pool temperature during a heat wave, not just add it, while the HP50TA only ever heats. That’s a genuine capability gap, not a cosmetic one — and it’s exactly the kind of thing a near-identical model number (HP50HA vs. HP50TA, one letter apart) makes easy to miss while comparison-shopping.

Pricing doesn’t sort cleanly by feature set, either. The heat-only HP50TA commonly lists in the $2,400-$2,600 range across pool-supply retailers, while the heat/cool HP50HA has been listed anywhere from about $1,585 to $2,999 depending on the retailer — meaning the model with the extra cooling capability isn’t reliably the pricier one. Shoppers who assume “more features = higher price” and default to the HP50TA as the “basic, cheaper” option can easily end up paying more for less capability.

Which HeatPro model actually fits your pool

For an in-ground pool, the HP21405T is the only current-production in-ground HeatPro — there’s no model decision to make beyond confirming you’re not quoted the discontinued HP21404T. For an above-ground pool or spa, the decision comes down to whether you want cooling capability: choose the HP50HA if lowering water temperature on hot days matters to you, or the HP50TA if you only ever need to heat and prefer the larger 2 inch plumbing ports. Either way, compare actual listed prices rather than assuming the model name tells you which is cheaper. For the full brand lineup including Hayward’s gas Universal H-Series, see our best Hayward pool heater guide; for how HeatPro stacks up against Raypak’s and Pentair’s heat pumps on COP and price, see our Raypak vs. Hayward and Hayward vs. Pentair comparisons. If you’re still deciding between a heat pump and gas entirely, our gas vs. heat pump breakdown covers the running-cost math behind that choice.

The bottom line

“HeatPro” isn’t a single product — it’s a line that splits into a 140,000 BTU in-ground tier (current: HP21405T, discontinued: HP21404T) and a 50,000 BTU above-ground tier (HP50HA with cooling mode, HP50TA without). The in-ground swap from HP21404T to HP21405T is a straightforward upgrade at roughly the same price. The above-ground HP50HA/HP50TA split is the trickier one: the models differ in real capability (cooling mode, port size, fan placement), and retail pricing doesn’t reliably track which one is “better,” so check the specific spec sheet and listed price rather than assuming the model number alone tells you what you’re buying.

Sources: Hayward — HeatPro MCHX Series Heat Pump, 140,000 BTU (HP21405T), Hayward — HeatPro In-Ground Heat Pump, 140,000 BTU, Square Platform (HP21404T), INYOPools — Hayward HeatPro Heat Pump 50,000 BTU (HP50TA), The Pool Factory — Hayward Titanium 50K BTU Electric Heat Pump (HP50HA)