Spa Heater Parts

Spa Heater Parts

109 products

  • -47% Off
    Screw, Balboa, 8 x 5/8, Self Tapping, Stainless Steel

    Screw, Balboa, 8 x 5/8, Self Tapping, Stainless Steel

    Screw, Balboa, 8 x 5/8, Self Tapping, Stainless Steel

    Balboa Water Group

    50087
    Sale Price Value: 0 Sale Price Number: 0 Website Price Value: 0 Website Price Number: 0 All Metafields: {"bundle":"gid:\/\/shopify\/Metaobject\/110519484481","mpn":"50087","warehouselocations":"Las Vegas, NV","warranty":"12 Months"}
    $9.90
    $18.70 $9.90
  • -48% Off
    O-Ring, WW No-Flo Gate Valve, 1-1/2", Union, OEM

    O-Ring, WW No-Flo Gate Valve, 1-1/2", Union, OEM

    O-Ring, WW No-Flo Gate Valve, 1-1/2", Union, OEM

    Waterway Plastics

    805-0224
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    $9.90
    $19.40 $9.90
  • -56% Off
    Hose Barb Service Kit

    Hose Barb Service Kit

    Hose Barb Service Kit

    Hayward

    SMXHP2215
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    $26.50
    $60.90 $26.50
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  • -51% Off
    Thermostat, Raypak 53/53A/55A, Auto Reset 14-B

    Thermostat, Raypak 53/53A/55A, Auto Reset 14-B

    Thermostat, Raypak 53/53A/55A, Auto Reset 14-B

    Raypak

    600890B
    Sale Price Value: 0 Sale Price Number: 0 Website Price Value: 0 Website Price Number: 0 All Metafields: {"bundle":"gid:\/\/shopify\/Metaobject\/110527053889","discontinued":false,"mpn":"600890B","saleprice":"0","warehouselocations":"Bloomfield, CT","warranty":"12 Months"}
    $48.30
    $100.20 $48.30
    Liquid error (snippets/card-product line 647): comparison of String with 0 failed
  • -43% Off
    O-Ring Viton For 1Kw Heater

    O-Ring Viton For 1Kw Heater

    O-Ring Viton For 1Kw Heater

    Balboa Water Group

    50073
    Sale Price Value: 0 Sale Price Number: 0 Website Price Value: 0 Website Price Number: 0 All Metafields: {"discontinued":false,"mpn":"50073","saleprice":"0","warehouselocations":"Memphis, TN | Tucson, AZ"}
    $9.90
    $17.60 $9.90
    Liquid error (snippets/card-product line 647): comparison of String with 0 failed
  • -57% Off
    Indicator Light, Raypak 185A

    Indicator Light, Raypak 185A

    Indicator Light, Raypak 185A

    Raypak

    005064B
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    $11.80
    $27.50 $11.80
    Liquid error (snippets/card-product line 647): comparison of String with 0 failed
  • -46% Off
    Screw, Gecko AquaFlo, 8-32 x 5/8"

    Screw, Gecko AquaFlo, 8-32 x 5/8"

    Screw, Gecko AquaFlo, 8-32 x 5/8"

    Aqua-Flo

    99730050
    Sale Price Value: 0 Sale Price Number: 0 Website Price Value: 0 Website Price Number: 0 All Metafields: {"discontinued":false,"mpn":"99730050","saleprice":"0","warehouselocations":"Las Vegas, NV","warranty":"12 Months"}
    $9.90
    $18.50 $9.90
    Liquid error (snippets/card-product line 647): comparison of String with 0 failed
  • -51% Off
    Thermostat, Raypak 53/53A/55A, Auto Reset 13-B

    Thermostat, Raypak 53/53A/55A, Auto Reset 13-B

    Thermostat, Raypak 53/53A/55A, Auto Reset 13-B

    Raypak

    600889B
    Sale Price Value: 0 Sale Price Number: 0 Website Price Value: 0 Website Price Number: 0 All Metafields: {"bundle":"gid:\/\/shopify\/Metaobject\/110527021121","discontinued":false,"mpn":"600889B","saleprice":"0","warehouselocations":"Bloomfield, CT","warranty":"12 Months"}
    $48.30
    $100.20 $48.30
    Liquid error (snippets/card-product line 647): comparison of String with 0 failed
  • -47% Off
    Freeze Protection Thermostat

    Freeze Protection Thermostat

    Freeze Protection Thermostat

    Intermatic

    178T24
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    $76.60
    $146.00 $76.60
    Liquid error (snippets/card-product line 647): comparison of String with 0 failed
  • -56% Off
    B8 Hi-Limit Sensor

    B8 Hi-Limit Sensor

    B8 Hi-Limit Sensor

    United Spas

    EL120
    Sale Price Value: 0 Sale Price Number: 0 Website Price Value: 0 Website Price Number: 0 All Metafields: {"discontinued":false,"mpn":"EL120","saleprice":"0","warehouselocations":"Tucson, AZ","warranty":"12 Months"}
    $27.00
    $62.00 $27.00
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  • -49% Off
    Blower Cooling Fan, Raypak D-2 206-406/207-407

    Blower Cooling Fan, Raypak D-2 206-406/207-407

    Blower Cooling Fan, Raypak D-2 206-406/207-407

    Raypak

    011549F
    Sale Price Value: 0 Sale Price Number: 0 Website Price Value: 0 Website Price Number: 0 All Metafields: {"bundle":"gid:\/\/shopify\/Metaobject\/110526857281","discontinued":false,"mpn":"011549F","saleprice":"0","warehouselocations":"Bloomfield, CT","warranty":"12 Months"}
    $60.10
    $119.80 $60.10
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  • -47% Off
    Heater O-Ring, 4" For HT Heaters Series

    Heater O-Ring, 4" For HT Heaters Series

    Heater O-Ring, 4" For HT Heaters Series

    Allied Innovations

    60-0001
    Sale Price Value: 0 Sale Price Number: 0 Website Price Value: 0 Website Price Number: 0 All Metafields: {"mpn":"60-0001","warehouselocations":"Las Vegas, NV","warranty":"12 Months"}
    $9.90
    $18.80 $9.90
  • -55% Off
    Cord, AMP splitter Hydro Quip 48-0044A

    Cord, AMP splitter Hydro Quip 48-0044A

    Cord, AMP splitter Hydro Quip 48-0044A

    Hydro-Quip

    48-0044A
    Sale Price Value: 0 Sale Price Number: 0 Website Price Value: 0 Website Price Number: 0 All Metafields: {"bundle":"gid:\/\/shopify\/Metaobject\/110255865921","discontinued":false,"mpn":"48-0044A","saleprice":"0","warehouselocations":"Memphis, TN | Tucson, AZ","warranty":"12 Months"}
    $21.80
    $48.50 $21.80
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  • -58% Off
    Coates Gasket, Cph, Phs, Ce

    Coates Gasket, Cph, Phs, Ce

    Coates Gasket, Cph, Phs, Ce

    Coates Heater

    44000250
    Sale Price Value: 0 Sale Price Number: 0 Website Price Value: 0 Website Price Number: 0 All Metafields: {"bundle":"gid:\/\/shopify\/Metaobject\/110255669313","discontinued":false,"mpn":"44000250","saleprice":"0","warehouselocations":"Bloomfield, CT","warranty":"12 Months"}
    $12.50
    $30.30 $12.50
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  • -45% Off
    Gasket, 5" Thermcore

    Gasket, 5" Thermcore

    Gasket, 5" Thermcore

    Horizon Spa & Pool Parts

    _RMG-03-657
    Sale Price Value: 0 Sale Price Number: 0 Website Price Value: 0 Website Price Number: 0 All Metafields: {"mpn":"_RMG-03-657","warehouselocations":"Tucson, AZ","warranty":"12 Months"}
    $9.90
    $18.20 $9.90
  • -37% Off
    Laing 5.5kW 240V Replacement Spa Heater for Jacuzzi/Sundance

    Laing 5.5kW 240V Replacement Spa Heater for Jacuzzi/Sundance

    Laing 5.5kW 240V Replacement Spa Heater for Jacuzzi/Sundance

    Laing

    HTAC32292A
    Sale Price Value: 0 Sale Price Number: 0 Website Price Value: 0 Website Price Number: 0 All Metafields: {"mpn":"HTAC32292A","warehouselocations":"Bloomfield, CT"}
    $215.50
    $344.80 $215.50

Spa Heater Parts

Repair your spa or hot tub heater assembly with individual spa heater parts from Balboa Water Group, Hydro-Quip, Therm Products, Waterway Plastics, and Custom Molded Products. PST Pool Supplies stocks gaskets, tailpieces, sensors, snap nuts, heater connection kits, and temperature sensors — the components most frequently needed for spa heater service — starting from $9.50.

Spa heaters are modular assemblies — when a specific component fails, replacing the individual part is often far more economical than replacing the entire heater unit. The key parts in this collection: Heater gaskets and O-rings from Balboa and Hydro-Quip seal the heater tube unions and manifold connections — the Hydro-Quip Watkins Double Barrel Heater Gasket Kit provides the complete set of gaskets for Watkins double-barrel heater assemblies, and the Balboa 2\" O-Ring Gasket seals Balboa heater union connections. Heater tailpieces from Therm Products and Hydro-Quip are the threaded plumbing fittings that connect the heater tube to the spa's plumbing manifold — available in 2-1/4\" and 3\" male buttress thread (MBT) with 3/4\" barb or slip connections at 90°. Buttress thread is a coarse-pitch thread specific to spa heater plumbing; the correct tailpiece thread size must match the heater tube body exactly. Snap nuts and split nuts (Hydro-Quip 2\" buttress thread, Waterway 1-1/2\" buttress thread) are the quick-disconnect retaining nuts on spa heater unions — these become brittle and crack with age and heat cycling. Temperature and hi-limit sensors from Therm Products (IQ2000 series, 52\" wire, 2-pin connector) are the thermocouple sensors that monitor water temperature at the heater and protect against overheating. The Balboa BP Heater Connection Kit and Balboa 16\" heater-to-board cable are the electrical connection components between the heater element and the Balboa control board. The Custom Molded Products Raypak Half Union Kit (2\" slip with O-ring, qty 2) provides complete union assemblies for Raypak heater installations in in-ground spas.

When servicing a spa heater, the most commonly replaced wear components are: tailpiece gaskets (whenever unions are disconnected — always replace rather than reuse), snap nuts (if cracked or stripped), and temperature sensors (when the spa misreads temperature or trips the hi-limit repeatedly). Always turn off spa power at the breaker before opening any heater connections, and drain below the heater level before disconnecting plumbing unions.

Shop spa heater parts at PST Pool Supplies and complete your heater repair with the exact component your system requires.

Frequently Asked Questions

What is a spa heater tailpiece and when does it need replacement?
A heater tailpiece is the threaded fitting that connects the spa heater tube body to the spa's plumbing manifold — it is the transition between the heater's buttress-thread port and the barb or slip fitting that connects to the spa plumbing. Tailpieces are made of polypropylene or similar heat-resistant plastic and thread into the heater tube with a coarse male buttress thread (MBT) — 2-1/4" MBT and 3" MBT are the most common sizes. Replace a tailpiece when: (1) The plastic has cracked — heat cycling and chemical exposure make tailpieces brittle over years of service; a cracked tailpiece leaks at the heater connection. (2) The threads are stripped — overtightening or cross-threading during service strips the buttress thread. (3) The 90° elbow direction needs to change — tailpieces orient the plumbing connection direction; a replacement may be needed if the plumbing layout is modified. Match the replacement tailpiece to the original's MBT size, outlet size (3/4" barb or slip), and angle — all tailpieces in this collection are 90° orientation.
How do I replace a spa heater snap nut or split nut?
Snap nuts and split nuts are the quick-disconnect retaining rings on spa heater union fittings that allow the heater tube to be disconnected from the plumbing without cutting pipe. They fail by cracking (from heat cycling and brittleness) or stripping (from overtightening). Replacement steps: (1) Turn off spa power at the breaker. (2) Drain below the heater level or close the pump union to isolate the heater. (3) Unscrew the damaged snap nut counterclockwise — if cracked, it may fall apart during removal; have a towel ready to catch any water. (4) Slide the new snap nut over the tailpiece or union body (snap nuts must be installed before connecting the union, as they cannot be added after the union is assembled). (5) Reconnect the union and thread the snap nut clockwise until hand-tight, then 1/4 turn with pliers — do not overtighten plastic nuts. The Hydro-Quip 2" buttress thread snap nut fits Hydro-Quip heater unions; the Waterway 1-1/2" split nut fits Waterway union assemblies.
How do I replace a spa temperature or hi-limit sensor?
Spa temperature and hi-limit sensors are small thermocouple probes (1/4" diameter, 52" wire) that slide into sensor wells on the heater manifold. Replacement is straightforward: (1) Turn off spa power at the breaker. (2) Locate the sensor wells on the heater manifold — typically two wells side by side, one for the temperature sensor (blue wire on IQ2000 series) and one for the hi-limit (red wire). (3) Disconnect the 2-pin connector from the control board — trace the wire from the sensor to the board and unplug the connector. (4) Pull the old sensor out of the well — sensors are held by friction or a small retaining clip; pull straight out. (5) Insert the new sensor fully into the well — the probe must seat completely for accurate temperature reading. (6) Route the wire away from hot surfaces and reconnect the 2-pin connector to the board. (7) Test: restore power and confirm the spa reads accurate temperature. A temperature sensor failure typically causes the spa to display incorrect water temperature; a hi-limit sensor failure typically causes nuisance hi-limit trips (OH error) or failure to heat.
When should I replace heater gaskets versus just resealing a leaking union?
Heater union gaskets (flat face gaskets and O-rings) should be replaced every time a union is disconnected for service — this is a best practice, not optional. Once a heater union gasket has been compressed and heat-cycled, it rarely re-seals reliably after being disturbed. The cost of a replacement gasket ($10–$25) is trivial compared to the labor of re-draining and re-servicing a leaking heater union. Situations that specifically require gasket replacement: (1) Any active leak at a heater union — do not attempt to stop a union leak by tightening further; overtightening cracks plastic nuts. Drain, disassemble, replace the gasket, reassemble. (2) After element replacement — the heater tube must be disconnected to access the element; always install new gaskets when reassembling. (3) After annual spa drain and refill — inspect all heater union gaskets when the heater is accessible with water drained; replace any that show compression set (flattened, no longer round in cross-section) or cracking. The Hydro-Quip Watkins Double Barrel Heater Gasket Kit provides all gaskets needed for a complete Watkins heater service in one kit.