Heater Unions

Heater unions are the threaded fittings that connect your spa heater to the plumbing system, allowing the heater to be removed and reinstalled without cutting pipes. A leaking or cracked heater union can cause water loss and must be replaced to maintain a watertight system. Spa Guy Parts carries replacement heater unions in the most common sizes used across major spa brands. Quality unions ensure a secure, leak-free connection every time. Shop now—free shipping on all orders over $75.