Spa Heaters

Spa Heaters

199 products

  • Spa Components-Manifold, Heater, 2" Slip x 2" Slip, 15", Flow Thru

    Spa Components-Manifold, Heater, 2" Slip x 2" Slip, 15", Flow Thru

    Spa Components-Manifold, Heater, 2" Slip x 2" Slip, 15", Flow Thru

    Spa Components

    SKU: PST-47-371-1200
    MPN: B240Q
    Sale Price Value: 0 Sale Price Number: 0 Website Price Value: 0 Website Price Number: 0 All Metafields: {"bundle":"gid:\/\/shopify\/Metaobject\/110548090945","discontinued":false,"mpn":"B240Q","saleprice":"0","warehouselocations":"Memphis, TN | Tucson, AZ","warranty":"12 Months"}
    $44.60
    $95.00 $44.60
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  • Heater, FloThru, Universal, 15" x 2", 230v, 5.5kW, w/Union

    Heater, FloThru, Universal, 15" x 2", 230v, 5.5kW, w/Union

    Heater, FloThru, Universal, 15" x 2", 230v, 5.5kW, w/Union

    Hydro-Quip

    SKU: PST-46-555-2210
    MPN: 48-1555-HS
    Sale Price Value: 0 Sale Price Number: 0 Website Price Value: 0 Website Price Number: 0 All Metafields: {"bundle":"gid:\/\/shopify\/Metaobject\/110510702657","discontinued":false,"mpn":"48-1555-HS","saleprice":"0","warehouselocations":"Memphis, TN | Tucson, AZ","warranty":"12 Months"}
    $115.20
    $206.90 $115.20
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  • Heater, FloThru, DM/Vita Repl, 17-3/4" x 2", 230v, 5.5kW, Gen2

    Heater, FloThru, DM/Vita Repl, 17-3/4" x 2", 230v, 5.5kW, Gen2

    Heater, FloThru, DM/Vita Repl, 17-3/4" x 2", 230v, 5.5kW, Gen2

    Hydro-Quip

    SKU: PST-46-355-3218
    MPN: 26-1008-7S-K
    Sale Price Value: 0 Sale Price Number: 0 Website Price Value: 0 Website Price Number: 0 All Metafields: {"bundle":"gid:\/\/shopify\/Metaobject\/110508933185","discontinued":false,"mpn":"26-1008-7S-K","saleprice":"0","warehouselocations":"Idaho Falls, ID","warranty":"12 Months"}
    $127.00
    $282.40 $127.00
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  • Heater, FloThru, Universal, 15" x 2", 230v, 4.0kW, w/Union

    Heater, FloThru, Universal, 15" x 2", 230v, 4.0kW, w/Union

    Heater, FloThru, Universal, 15" x 2", 230v, 4.0kW, w/Union

    Hydro-Quip

    SKU: PST-46-555-2206
    MPN: 48-1540-HS
    Sale Price Value: 0 Sale Price Number: 0 Website Price Value: 0 Website Price Number: 0 All Metafields: {"bundle":"gid:\/\/shopify\/Metaobject\/110510669889","discontinued":false,"mpn":"48-1540-HS","saleprice":"0","warehouselocations":"Memphis, TN | Tucson, AZ","warranty":"12 Months"}
    $115.20
    $206.90 $115.20
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  • Heater, LowFlow, Watkins, 230v, 4.0kW, Auto Reset, Generic

    Heater, LowFlow, Watkins, 230v, 4.0kW, Auto Reset, Generic

    Heater, LowFlow, Watkins, 230v, 4.0kW, Auto Reset, Generic

    Hydro-Quip

    SKU: PST-46-355-3068
    MPN: 26-C3160-2S
    Sale Price Value: 0 Sale Price Number: 0 Website Price Value: 0 Website Price Number: 0 All Metafields: {"bundle":"gid:\/\/shopify\/Metaobject\/110508638273","mpn":"26-C3160-2S","warehouselocations":"Murray, UT","warranty":"12 Months"}
    $355.20
    $549.00 $355.20
  • Heater, FloThru, Morgan Repl, 15" x 2", 230v, 5.5kW, Gen 2

    Heater, FloThru, Morgan Repl, 15" x 2", 230v, 5.5kW, Gen 2

    Heater, FloThru, Morgan Repl, 15" x 2", 230v, 5.5kW, Gen 2

    Spa Components

    SKU: PST-46-510-3304
    MPN: B24055U
    Sale Price Value: 0 Sale Price Number: 0 Website Price Value: 0 Website Price Number: 0 All Metafields: {"bundle":"gid:\/\/shopify\/Metaobject\/110510440513","discontinued":false,"mpn":"B24055U","saleprice":"0","warehouselocations":"Memphis, TN | Tucson, AZ","warranty":"12 Months"}
    $122.60
    $220.30 $122.60
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  • Heater, LowFlow, Watkins, 230v, 6.0kW, Auto Reset, Generic

    Heater, LowFlow, Watkins, 230v, 6.0kW, Auto Reset, Generic

    Heater, LowFlow, Watkins, 230v, 6.0kW, Auto Reset, Generic

    Hydro-Quip

    SKU: PST-46-355-3066
    MPN: 26-C3160-1S
    Sale Price Value: 0 Sale Price Number: 0 Website Price Value: 0 Website Price Number: 0 All Metafields: {"bundle":"gid:\/\/shopify\/Metaobject\/110508605505","mpn":"26-C3160-1S","saleprice":"0","warehouselocations":"Bloomfield, CT","warranty":"12 Months"}
    $400.40
    $618.80 $400.40
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  • Heater, FloThru, Sundance/Spa Bldrs, 15" x 2", 230v, 5.5kW

    Heater, FloThru, Sundance/Spa Bldrs, 15" x 2", 230v, 5.5kW

    Heater, FloThru, Sundance/Spa Bldrs, 15" x 2", 230v, 5.5kW

    Spa Components

    SKU: PST-46-510-3214
    MPN: B24055Q
    Sale Price Value: 0 Sale Price Number: 0 Website Price Value: 0 Website Price Number: 0 All Metafields: {"bundle":"gid:\/\/shopify\/Metaobject\/110510309441","discontinued":false,"mpn":"B24055Q","saleprice":"0","warehouselocations":"Memphis, TN | Tucson, AZ","warranty":"12 Months"}
    $116.40
    $210.40 $116.40
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  • Heater, LowFlow, Watkins, 6.0kW, w/Sens, Pr. Switch, Generic

    Heater, LowFlow, Watkins, 6.0kW, w/Sens, Pr. Switch, Generic

    Heater, LowFlow, Watkins, 6.0kW, w/Sens, Pr. Switch, Generic

    Hydro-Quip

    SKU: PST-46-355-3062
    MPN: 26-C3072-1
    Sale Price Value: 0 Sale Price Number: 0 Website Price Value: 0 Website Price Number: 0 All Metafields: {"bundle":"gid:\/\/shopify\/Metaobject\/110508572737","discontinued":false,"mpn":"26-C3072-1","saleprice":"0","warehouselocations":"Memphis, TN | Tucson, AZ | Las Vegas, NV"}
    $478.00
    $738.40 $478.00
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  • Heater, FloThru, Acura/ACC 15" x 2", 230v, 5.5kW, w/o TlPc

    Heater, FloThru, Acura/ACC 15" x 2", 230v, 5.5kW, w/o TlPc

    Heater, FloThru, Acura/ACC 15" x 2", 230v, 5.5kW, w/o TlPc

    Spa Components

    SKU: PST-46-510-3208
    MPN: B24055B
    Sale Price Value: 0 Sale Price Number: 0 Website Price Value: 0 Website Price Number: 0 All Metafields: {"bundle":"gid:\/\/shopify\/Metaobject\/110510276673","discontinued":false,"mpn":"B24055B","saleprice":"0","warehouselocations":"Tucson, AZ","warranty":"12 Months"}
    $116.40
    $210.40 $116.40
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  • Heater, FloThru, Artic Spas Repl, 12"x2", 230v, 5.5kW, w/ Cord, Gen

    Heater, FloThru, Artic Spas Repl, 12"x2", 230v, 5.5kW, w/ Cord, Gen

    Heater, FloThru, Artic Spas Repl, 12"x2", 230v, 5.5kW, w/ Cord, Gen

    Hydro-Quip

    SKU: PST-46-355-3035
    MPN: 48-9120-7P-K
    Sale Price Value: 0 Sale Price Number: 0 Website Price Value: 0 Website Price Number: 0 All Metafields: {"bundle":"gid:\/\/shopify\/Metaobject\/110508376129","mpn":"48-9120-7P-K","saleprice":"0","warehouselocations":"Bloomfield, CT","warranty":"12 Months"}
    $170.90
    $291.10 $170.90
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  • Heater, FloThru, Gecko S-Class Repl, 15"x2", 230v, 5.5kW, Gen 2

    Heater, FloThru, Gecko S-Class Repl, 15"x2", 230v, 5.5kW, Gen 2

    Heater, FloThru, Gecko S-Class Repl, 15"x2", 230v, 5.5kW, Gen 2

    Spa Components

    SKU: PST-46-510-3207
    MPN: B24055SD
    Sale Price Value: 0 Sale Price Number: 0 Website Price Value: 0 Website Price Number: 0 All Metafields: {"bundle":"gid:\/\/shopify\/Metaobject\/110510243905","discontinued":false,"mpn":"B24055SD","saleprice":"0","warehouselocations":"Memphis, TN | Tucson, AZ","warranty":"12 Months"}
    $121.00
    $218.90 $121.00
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  • Heater Assembly, LowFlow, 5.5kw, HydroQuip Slipstream, 230V

    Heater Assembly, LowFlow, 5.5kw, HydroQuip Slipstream, 230V

    Heater Assembly, LowFlow, 5.5kw, HydroQuip Slipstream, 230V

    Hydro-Quip

    SKU: PST-46-355-3045
    MPN: 27-SAA0C-7T-K
    Sale Price Value: 0 Sale Price Number: 0 Website Price Value: 0 Website Price Number: 0 All Metafields: {"bundle":"gid:\/\/shopify\/Metaobject\/110508507201","discontinued":false,"mpn":"27-SAA0C-7T-K","saleprice":"0","warehouselocations":"Memphis, TN | Las Vegas, NV"}
    $416.80
    $644.00 $416.80
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  • Heater, FloThru, BWG, 15" x 2", 230v, 4.0kW, w/o PS, Generic

    Heater, FloThru, BWG, 15" x 2", 230v, 4.0kW, w/o PS, Generic

    Heater, FloThru, BWG, 15" x 2", 230v, 4.0kW, w/o PS, Generic

    Spa Components

    SKU: PST-46-510-3102
    MPN: B24040N
    Sale Price Value: 0 Sale Price Number: 0 Website Price Value: 0 Website Price Number: 0 All Metafields: {"bundle":"gid:\/\/shopify\/Metaobject\/110510178369","discontinued":false,"mpn":"B24040N","saleprice":"0","warehouselocations":"Memphis, TN | Tucson, AZ","warranty":"12 Months"}
    $116.40
    $210.40 $116.40
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  • Heater, LowFlow, Watkins, 4.0kW, w/Sens, Pr. Switch, Generic

    Heater, LowFlow, Watkins, 4.0kW, w/Sens, Pr. Switch, Generic

    Heater, LowFlow, Watkins, 4.0kW, w/Sens, Pr. Switch, Generic

    Hydro-Quip

    SKU: PST-46-355-3060
    MPN: 26-C3072-2
    Sale Price Value: 0 Sale Price Number: 0 Website Price Value: 0 Website Price Number: 0 All Metafields: {"bundle":"gid:\/\/shopify\/Metaobject\/110508539969","discontinued":false,"mpn":"26-C3072-2","saleprice":"0","warehouselocations":"Memphis, TN | Tucson, AZ | Las Vegas, NV"}
    $478.00
    $738.40 $478.00
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  • Heater, FloThru, ACC Repl, 12-1/2" x 2", 230v, 5.5kW, Generic

    Heater, FloThru, ACC Repl, 12-1/2" x 2", 230v, 5.5kW, Generic

    Heater, FloThru, ACC Repl, 12-1/2" x 2", 230v, 5.5kW, Generic

    Spa Components

    SKU: PST-46-510-3040
    MPN: B24055K
    Sale Price Value: 0 Sale Price Number: 0 Website Price Value: 0 Website Price Number: 0 All Metafields: {"bundle":"gid:\/\/shopify\/Metaobject\/110510112833","discontinued":false,"mpn":"B24055K","saleprice":"0","warehouselocations":"Memphis, TN | Tucson, AZ","warranty":"12 Months"}
    $122.60
    $220.30 $122.60
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Spa Heaters

Replace a failed spa heater assembly with a direct-fit flow-through spa heater for Sundance, Gecko, BWG, Morgan, ACC, CorrectTech, and other major spa platforms. PST Pool Supplies stocks brand-matched heater assemblies in 4.0kW and 5.5kW / 230V configurations — starting from $108.10.

A spa heater assembly is the complete stainless steel tube with heating element, pressure switch ports, thermowell, and mounting hardware — a complete drop-in replacement when the heater tube itself is damaged, corroded, or structurally failed beyond element replacement. All heaters in this collection use the flow-through design: water flows continuously through the stainless tube past the heating element, providing efficient heat transfer without stagnant hot zones. Key models stocked: the Universal Flow-Thru Heater (15\" x 2\", 230V, 4.0kW and 5.5kW, with union) is a widely compatible replacement for spas with standard 15\" heater configurations — includes union fittings for direct connection to existing plumbing. The Sundance/Spa Builders specific heater (15\" x 2\", 230V, 5.5kW) is matched to Sundance spa heater manifolds. The Gecko S-Class replacement (15\" x 2\", 230V, 5.5kW, Gen 2) fits Gecko S-Class controlled spas. The Morgan replacement heater (Gen 2) and ACC/Acura replacement heaters provide OEM-matched geometry for those platforms. The CorrectTech/Ingenious heater (11\" x 2\", 230V, 5.5kW) serves the shorter 11\" heater configuration used in some compact spa systems. The Spa Components flow-through manifold (15\", 2\" slip x 2\" slip) is the plumbing manifold body used with separate element installations. The BWG replacement heater (15\" x 2\", 230V, 4.0kW, without pressure switch) fits Balboa Water Group controlled spas that use an external pressure switch.

When selecting a replacement heater, confirm: (1) tube length (11\" or 15\" are the most common), (2) connection size (2\" slip or union), (3) voltage (230V for virtually all residential spas), (4) kW rating (5.5kW is the most common residential rating; confirm against your original heater label), and (5) pressure switch configuration (with or without — match the original). Most heater swaps require only basic plumbing disconnection and reconnection and take under an hour.

Shop spa replacement heaters at PST Pool Supplies and restore full heating performance to your hot tub with a brand-matched assembly.

Frequently Asked Questions

How do I know if my spa needs a full heater assembly replacement versus just an element?
Replace the complete heater assembly when: (1) The stainless steel heater tube is corroded or pinholed — rust through or pitting in the tube wall cannot be repaired; the tube must be replaced. Corroded tubes are common in spas with chronically low pH or high salt content. (2) The heater tube threads or union ports are stripped — if the tailpiece or union threads are damaged, the tube body must be replaced. (3) The pressure switch port is cracked or leaking — pressure switch ports are integral to the heater tube casting. (4) Multiple components have failed simultaneously — if the element, gaskets, and tube all show wear, a complete assembly replacement is more economical than sourcing individual parts. Replace only the element when: the stainless tube is structurally sound, the tube shows no corrosion or scale buildup beyond what can be descaled, and the failure is confirmed as element burnout by multimeter test (open circuit across element terminals). Element-only replacement costs $37–$50 versus $108–$123 for a complete assembly — if the tube is in good condition, element replacement is the right call.
Do I need to match the heater brand to my spa brand?
For most residential spas, brand matching improves fit but is not always strictly necessary — what must match is the physical geometry (tube length, connection size, pressure switch port configuration) and electrical specifications (voltage, kW). The brand-specific heaters (Sundance/Spa Builders, Gecko S-Class, BWG, ACC) ensure the pressure switch port location, thermowell position, and mounting stud pattern match the original heater manifold mounting in those specific spa platforms. Using the Universal flow-thru heater (15" x 2", with union) works for many spa brands when the geometry matches — the universal designation means it accommodates a wide range of manifold configurations. The critical check: measure the existing heater tube length (11" or 15"), connection type (2" slip or union), and whether the original included a pressure switch port and/or tailpieces — some models are sold "without tailpiece" (w/o TlPc) or "without pressure switch" (w/o PS) and require those components from the original installation.
How do I replace a spa flow-through heater assembly?
Heater assembly replacement is an intermediate DIY repair: (1) Turn off spa power at the breaker and confirm off with a voltage tester. (2) Drain the spa below the heater level — the heater is in the equipment cabinet, typically the lowest plumbing component. (3) Photograph the existing heater wiring before disconnecting — note which wires go to element terminals, pressure switch, and ground. (4) Disconnect all wires from heater terminals. (5) Unscrew the union fittings or tailpiece connections on both ends of the heater tube. (6) Remove the old heater from its mounting bracket. (7) Transfer any components not included with the new heater (pressure switch, tailpieces, thermostat covers) from the old unit if compatible. (8) Mount the new heater in the bracket and reconnect plumbing unions with new gaskets. (9) Reconnect all wiring per your photograph. (10) Refill the spa, restore power, and test — verify no leaks at unions and that the heater energizes and heats normally within 15–20 minutes.
What causes a spa heater to fail prematurely?
The four most common causes of early spa heater failure: (1) Low pH / acidic water — water below pH 7.2 attacks stainless steel, corroding the heater tube and element sheath. A spa running at pH 6.8–7.0 can corrode a heater tube within one season. Maintain pH between 7.4–7.6. (2) Scale buildup from high calcium hardness — calcium deposits on the element surface act as insulation, causing the element to overheat internally. At water temperatures above 104°F, scale formation accelerates. Keep calcium hardness between 150–250 ppm and use a scale inhibitor. (3) Dry-fire from failed flow switch or clogged filter — if the heater energizes without water flowing (failed flow switch or severely clogged filter), the element reaches destructive temperatures within seconds. A properly functioning flow switch is the heater's primary protection. (4) High chlorine or salt concentration — bromine or chlorine levels consistently above 5 ppm attack element sheaths; salt water systems with poorly maintained salinity (above 3500 ppm) accelerate corrosion. Titanium elements resist this; standard Incoloy elements do not.