Heat exchanger HWT and TWT connections swimming pool side HWT 35 and HWT 65: 1 1/2 inch IG connections heating side HWT 35: 3/4 inch AG HWT 65: 1 inch AG operating pressure heating side 10 bar bath water side 3 bar material HWT – V4A, stained and electropolished HWT Titanium – Titanium Silver Painted Design Outer Sheath with Shrink-Weld Pipe Snake and Diving Sleeve for Electronic Temperature Measurement. Internal built-in water diversion for optimal heating of bath water. Heating: the heat exchanger is heated via a central or low temperature heating system, depending on the type. Power 1 heat output at heating circuit temperature 90 °C, power 2 heat output at heating circuit temperature 60 °C