Quick answer: Pool heat pump compressors are sold OEM by all four major brands, but only as model-specific parts you’ll rarely be able to guess: Pentair UltraTemp 90/120/120HC use ZP-series scroll compressors like Pentair 473734Z ($1,950.99), Raypak Crosswind V 4550 uses Raypak 100-10000400 ($1,630.99), and Hayward’s pre-titanium HeatPro line lists parts like Hayward SMX11024836 (~$1,521.93). Installed cost — parts, labor, and legally-required refrigerant recovery — runs $1,200-$4,000, according to CoolToday’s HVAC compressor-repair data. Before ordering any of these, run the 50% rule: if the quote tops half of what a new heat pump costs, buying new almost always wins.
A pool heat pump compressor is the one part on this site’s parts-vein where we’re not going to tell you it’s a bargain fix. Every other component we’ve covered — capacitors, fan motors, control boards, high-limit switches — costs a few hundred dollars and either bolts in yourself or takes a tech an hour. A compressor is different: it’s the single most expensive component in the unit, refrigerant work is illegal to DIY without EPA certification, and according to pool-heat-pump lifespan data the compressor itself typically lasts 10-15 years — often close to the rest of the unit’s usable life. That combination means the real question usually isn’t “which part number do I order,” it’s “does this repair make financial sense at all.” Below are the real OEM parts by brand where a public retail listing exists, what a professional swap actually costs, and the math that tells you when to stop repairing and start shopping our pool heat pump picks instead.
Pool heat pump compressors at a glance
| Brand / model | OEM part | Price | Retail availability |
|---|---|---|---|
| Pentair UltraTemp 90/120/120HC | 473734Z (ZP83 scroll) | $1,950.99 | In stock, InyoPools |
| Pentair UltraTemp 70 | 474291Z (ZP49 scroll) | $1,463.99 | In stock, InyoPools |
| Raypak Crosswind V 4550 | 100-10000400 | $1,630.99 | In stock, InyoPools |
| Hayward HeatPro (pre-titanium, HP21404T-class) | SMX11024836 | ~$1,521.93 | In stock, specialty pool-parts sites |
| AquaCal/Gulfstream (SQ-series, model unconfirmed) | 8008006 scroll compressor | $1,015.00 | Listed, fitment not brand-confirmed |
Two honest gaps worth flagging up front: we found no publicly-sold compressor part for Hayward’s current titanium MCHX line (HP21405T and newer) or for Raypak’s largest Crosswind V 8550 — both likely route through factory or dealer channels rather than open retail. And AquaCal’s listed part doesn’t specify which SQ model it fits, so treat it as a starting point for a parts-counter conversation, not a confirmed match for your unit.
1. Pentair 473734Z — For UltraTemp 90/120/120HC
Pentair 473734Z ZP83 Scroll Compressor
- The best-documented compressor part of the four brands we checked — InyoPools lists a full model-specific range across Pentair's UltraTemp line, from the smaller ZP49 (Model 70, $1,463.99) up to 3-phase commercial versions.
- Pentair's UltraTemp 140/140HC — the model this site's heat pump picks and fan motor guide reference — wasn't listed with its own confirmed compressor SKU in this parts feed; don't assume it shares the 120's ZP83 without checking your unit's own compressor nameplate first.
- Before ordering, run the 50% rule below — a $1,950 part plus labor and refrigerant easily lands in "replace the heater" territory on an older UltraTemp.
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2. Raypak 100-10000400 — For Crosswind V 4550
Raypak 100-10000400 Crosswind V Compressor
- Confirmed for the 4550, the smallest model in Raypak's current Crosswind V lineup — the generation that replaced the discontinued R8450ti this site documented sitewide in our 09-07 model-supersession correction.
- No public retail SKU turned up for the larger 8550's compressor (a 10.45HP scroll unit per Raypak's own spec sheet) — that size likely ships through Raypak's dealer network rather than open retail.
- Cheapest confirmed compressor of the four brands here, which matters more than it sounds: on a roughly $4,550-$5,100 Crosswind V, this part alone is already close to a third of the unit's price before labor and refrigerant are added.
3. Hayward SMX11024836 & AquaCal 8008006
Hayward SMX11024836 / AquaCal 8008006 Scroll Compressors
- Hayward sells several compressor part numbers across its pre-titanium HeatPro generation (SMX11024836, HPX11024204, SMX10024899 for 3-phase units) rather than one universal part — match your unit's own compressor nameplate, not just its heater model number, before ordering.
- We could not confirm a standalone compressor part for the current titanium MCHX HP21405T line this site tracks as Hayward's replacement generation — check with a Hayward dealer if that's your unit.
- AquaCal's listed part is the lowest-priced compressor we found, but the retailer page doesn't specify which SQ-series or Gulfstream model it fits — confirm fitment with the parts counter before buying, not after.
The 50% rule: when repair stops making sense
A compressor is the one part on this site where the right answer is often “don’t repair it.” Two rules of thumb, both widely used in general HVAC repair guidance, apply directly here: if a repair quote exceeds roughly 50% of what a comparable new unit costs, replacement is the better financial move; a second version multiplies the unit’s age in years by the repair-cost estimate, and if that number tops $5,000, replacement wins there too. Run the math on a real example: a $2,500 installed compressor job on a 6-year-old $4,500 heat pump is 56% of the replacement cost on its own (fails the 50% rule) and scores 6 × $2,500 = $15,000 on the age-multiplied test (fails that one too) — both point the same direction. This is the same 50% threshold our repair cost guide already applies to gas valves and control boards, just triggered far more often here because the part itself costs so much more.
The math tilts toward “replace” even harder if your unit is already a discontinued generation. This site has documented three separate model-supersessions sitewide — Hayward’s HP21404T to the titanium HP21405T, Raypak’s R8450ti to the Crosswind V, and FibroPool’s FH120 mislabeling that turned out to actually be the FH255 — and a compressor failure on any now-discontinued model is a strong signal to check our current heat pump picks before paying for a part.
Why this is the one repair we won’t call DIY
Every other part on this site’s parts-vein — capacitors, fan motors, pressure switches, even the control board — gets a DIY-or-technician judgment call based on wiring complexity and warranty risk. A compressor doesn’t get that treatment, because it’s not our judgment call to make: swapping a compressor means recovering the old refrigerant charge and recharging the new one, and under the Clean Air Act, handling refrigerant like the R-410A used on current heat pump lines legally requires EPA Section 608 certification. That’s a hard legal line, not a difficulty rating — a licensed refrigerant tech has to do this job regardless of how mechanically confident you are.
The bottom line
A pool heat pump compressor runs $1,000-$2,600 in parts alone and $1,200-$4,000 installed once labor and legally-required refrigerant work are added — by far the priciest single-part repair covered on this site, and the one repair EPA rules put entirely off-limits to DIY. Before ordering any of the parts above, apply the 50% rule: get a written quote, compare it against a comparable new unit’s price, and if it’s close to half or more, our pool heat pump picks are the better next stop than a repair — especially if your unit is already one of the discontinued generations this site has tracked. If the symptom is a hum with no spin rather than a truly dead compressor, check the far cheaper capacitor first; if the fan itself won’t turn, that’s covered separately in our fan motor guide.
Sources: InyoPools — Pentair UltraTemp Heat Pump Parts, InyoPools — Raypak Crosswind V Series Parts, OnlinePoolShop — Hayward HeatPro Compressor, PoolHeatPumps.com — Gulfstream Scroll Compressor, CoolToday — Heat Pump Compressor Replacement Cost