8 ms·So the shower drains through it and the 'wrap around' pipe is the input to your hot water tank?by megak1d 3y agoSo the shower drains through it and the 'wrap around' pipe is the input to your hot water tank?pg314 3y agoNo, it preheats the cold water connected to your shower. Warmer cold water means you need less hot water to achieve the same temperature in the shower.megak1d 3y agoAh yes, that’s much neater and more localised. Thanks