Unions, Heater
Hot tub heater unions provide the critical connection between your heater assembly and spa plumbing. Our selection includes unions in various sizes to fit most heater configurations. A good union seal prevents leaks and makes future heater servicing quick and straightforward. We offer competitive international shipping rates to buyers worldwide.
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Plumbing Retrofit Kit for Dr Wellness & Water's Edge - ET-H3000/ET-H4000 Remote Heater Conversion
HTPOFAmerica
MSRP: $169.99$139.99Comprehensive plumbing conversion kit designed for select Dr. Wellness and Water's Edge hot tub models featuring Chinese Energy Saver Controls with ET-H3000 or ET-H4000 remote heaters that have reversed union configurations, enabling upgrade to...MSRP: $169.99$139.99 -
1-1/2" Heater Union Tailpiece Assembly - MBT x Slip w/Split Nut & Gasket
HTPOFAmerica
MSRP: $19.99$14.991-1/2" Heater Union Tailpiece Assembly - MBT x Slip w/Split Nut & GasketThis complete half union tailpiece kit provides a reliable connection solution for spa and hot tub heating systems. The threaded end measures approximately 2 3/8" across, while the...MSRP: $19.99$14.99 -
MSRP: $19.99$14.99 -
1 1/2" Slip x 2" Threaded Heater Union for Hot Tub Spa - Global
HTPOFAmerica
MSRP: $10.99$8.99Need help installing this component? Look up The Hot Tub Professor on YouTube for detailed installation guidance on 2" x 1 1/2" slip spa heater unions.This listing includes one 1 1/2" Slip x 2" Heater Union fitting. This adapter fitting accepts a 1 1/2"...MSRP: $10.99$8.99 -
2 1/2" Therm Style Union Gasket for Hot Tub Heater & Pump - 3 1/4" OD x 2 3/4" ID
HTPOFAmerica
MSRP: $9.99$7.99This component is a 2 1/2" Therm Style Union Gasket Only designed for installation with 2 1/2" heater or pump unions in your spa system.When working with 2 1/2" heaters or pumps, please verify measurements carefully as Global offers two distinct sizes of...MSRP: $9.99$7.99 -
Hot Tub Heater Split Nut 1 1/2" with 2 3/8" Threads - Includes 2 Screws for Spa Heater Union
HTPOFAmerica
MSRP: $11.99$6.99This listing is for one 1 1/2" Heater Split Nut Assembly that comes complete with split nut and (2) mounting screws designed for 1 1/2" Heater Union applications measuring approximately 2 3/8" OD. This heater flange split nut securely fastens to your...MSRP: $11.99$6.99 -
2" Spa Pump & Heater Union Gasket - Extra Thick 1/4" Flat Seal
Waterway Plastics
MSRP: $6.31$4.91This extra thick 1/4" flat seal gasket is specifically designed for 2" pump and heater unions in hot tubs and spas. Engineered with superior thickness for enhanced durability and leak prevention, this replacement gasket ensures a watertight connection...MSRP: $6.31$4.91 -
2" Heater Union Threaded MBT 3" OD x 2" Slip 2 3/8" ID with Gasket - Hot Tub Spa Parts
HTPOFAmerica
MSRP: $12.99$9.99You are purchasing a 2" Slip X 2" Heater Union with Gasket. This union accepts a 2" pipe or fitting on one end measuring approximately 2 3/8" Outside Diameter, and threads onto a 2" Heater Flange Split Nut on the opposite end measuring approximately 3"...MSRP: $12.99$9.99 -
2" Heater Split Nut for Hot Tub Spa Heater Union - Measures 3" - Includes Screws
HTPOFAmerica
MSRP: $11.99$6.99This listing is for one 2" Heater Split Nut assembly that includes the split nut component plus (2) mounting screws, designed for 2" Heater Unions with threads measuring approximately 3" from edge to edge. This heater flange split nut attaches directly...MSRP: $11.99$6.99 -
1 1/2" Pump Union Split Nut Emergency Repair Kit with Screws for Hot Tub Spa Pumps
HTPOFAmerica
MSRP: $13.99$10.99This 1 1/2" Pump Union Split Nut Emergency Repair Kit provides a fast solution for damaged pump union connections without requiring replacement of glued plumbing components. The kit contains one split nut plus two mounting screws designed for 1 1/2" pump...MSRP: $13.99$10.99 -
Cal Spa Mo-Flo Heater Union Gasket 2" ID x 3" ID with 2-5/8" Thin Lip
HTPOFAmerica
MSRP: $5.99$4.99This Mo-Flo heater union gasket is designed specifically for Cal Spa applications featuring a 2" inner diameter and 2-3/4" outer diameter. The distinguishing feature of this gasket is its 2-5/8" center to center small lip design. The lip profile is...MSRP: $5.99$4.99 -
2-1/2" Pump Union T Gasket - 3 5/8 Inside Thread Compatibility - 3 1/4" O.D. x 2 3/8" I.D.
HTPOFAmerica
MSRP: $9.99$7.99This 2 1/2" Pump Union Gasket Only creates a watertight seal between your pump and its 2 1/2" union fitting. Designed for unions measuring approximately 3 5/8" Inside Threads, this gasket features precise dimensions of 3 1/4" O.D. x 2 3/8" I.D. with a 2...MSRP: $9.99$7.99