The heater is built into the whirlpool system and as water passes through the coil it is heated. Please note the heater is not designed to heat the water from cold. Keeps your bath water hotter for longer. This item will be delivered with your Whirlpool Bath. The item "1.5 KW Inline Water Heater for Whirlpool Spa and Jacuzzi Baths" is in sale since Tuesday, March 20, 2018.This item is in the category "Business, Office & Industrial\Electrical Equipment & Supplies\Circuit Breakers & Disconnectors\Other Circuit Breakers". The seller is "thewhirlpoolbathshop" and is located in Southampton. This item can be shipped to United Kingdom.