Best Hot Tub Heater Parts in 2026

5.5kW @ 240V Titanium element - Low Flo

Fits Sundance spas 1995 & newer, 650-850 & 880 series

Includes High-Limit Sensor & Switch

INSTANT HEAT: Brings your pool or spa heater instantly to light without having to fiddle with knobs;

PART ONLY: Replacement ignition core for pool/hot tub heater units

MADE TO FIT: Fits Zodiac Jandy Legacy LRZE pool and spa heater models 200, 260, and 400

Package Include 1 pcs Heater Split Nut Unions with Screw , 1 pcs Heater Gasket / O-rings

Split Nut Measurement：The inner size is 2.3 inch, the outer size is 2.9 inch,fits 2" Heater Assemblies

Actual Oring Measurement：The inner size is 2.08 inch, the outer size is 2.87 inch，O-ring fits for Balboa,Gecko,HydroQuip,Spa Builders,Correctech,Spanet,not fits LX Heater

For Spa Hot Tub Pump Heater Union Gasket/O-Ring 711-4030 and 711-4010 Ribbed Gasket and Flat Gasket Works on Variety of Spas Pools.

The gasket measures around 2-7/8" across on the outside and the inside diameter is 2-1/8".

Use your choice of silicone grease on one side, or both sides, to help hold the spa gasket in place while assembling.

Item No. H20-RS1, come with 1-PC 110V 120V 60Hz, 2000W, hot tub heater, 2-PCS tube connectors (The tube is not included, you need to prepare an extra 1.5” hoses), suitable for a bathub with 200 gallons, up to 400 gallons.

Minimum working pressure 0.035MPa. we recommended to use at least 0.25HP/200W (1500GPH) pump to work well. The required heating time varies according to the environment and water temperature.

Temperature can be available from 0℃~45℃（32ºF~113ºF）, this thermostat turns on and off automatically according to the temperature you set. If temperature exceed 60℃(139ºF), reset button will flick out and cut off the power.

3 11/16" Outside Diameter Threaded Part

1" Barbed Glue In Fitting

Fits 3" Heater Assy found in Blue Ridge, Gatsby and More...

COMPATIBLE WITH - Balboa, Gecko, Spa Builders, Hydro'Quip, ACC, Watkins, Dimension'One Acura'Spas, Len'Garden, Coleman and many others. The heater housing must be a Flo-Thru metal tube.

UNIVERSAL DESIGN - For hot tub heater element can be used with a wide range of spa electric heater or swimming pool, etc. Package comes with mounting hardware (2x terminal nuts 2x o-rings 2x jam nuts) so that we can install it safely and easily.

EXCELLENT QUALITY - This balboa spa heater element was constructed of high quality material - Titanium. We recommend that the customer keep a heating element in case of a fail and this guarantees the hot water service to continue.

Gasket 2 3/8" Outside Diameter, Rib Size 1 7/8"

The Heater Union Accepts a 1 1/2" Pipe that measures about 1 7/8" OD..

To see the Video about this part search YouTube for this: Spa Heater 1 1/2" Split Nut Information How To Hot Tub Parts of America

2" Threaded Female Heater Side Measures about 3" Edge to Edge on the Threaded Side..

2" Slip Glueable Side Accepts a 2" Pvc Pipe or Fitting that measures about 2 3/8" OD..

Note: The color of the unions can vary black or white..

5.5kw Heater Element

115V or 230V

Fits 2" Heater Tube in Gecko S-Class SSPA Pack

4.0kw Heater Element

115V or 230V

Fits 2" Heater Tube in Gecko S-Class SSPA Pack

★The swimming pool heat exchanger is made of high-grade anticorrosive stainless steel, which has the characteristics of anti-rust and salt water resistance, so it is very durable and very suitable for chlorine or salt water swimming pools and spas. 1 1/2" FPT is used on one side of the swimming pool water, and 1" FPT is used for hot water.

★The salt pond heat exchanger adopts an innovative spiral winding design to ensure a continuous constant temperature and indirectly transfer heat between any hot water circuit, steam circuit and any swimming pool or spa facility.

★The shell-and-tube heat exchanger is based on the 60°C (140°F) temperature difference between the inlet and hot water, and can provide a fresh pond of 260 kBtu/hr. It gets hot immediately without waiting.

[Self-Heating]: When the water temperature reaches the preset temperature, the pool heater will automatically stop. And when the temperature is lower than the preset temperature, the heater will automatically turn on again.

[Dry Burning Prevention]: The swimming pool heater is equipped with a pressure switch to protect it from the risk of dry burning due to lack of water in the operating process. If the water pressure drops to 15kPa or less during operation, the pressure switch will shut off the power.

[High Temperature Protection]: The hot tub heater has a high temperature protection switch. When the temperature reaches 50°C due to a lack of water flow or a blockage in the inlet, the heater will trip (cut off power).