" Ok. I know there are countless discussion topics on this (I've read them!) but I'm after a little confirmation before I go cutting int my pipework.
I am fitting a new shower to the bathroom with a separate pump. After much deliberation, I have run a dedicated 22mm cold feed from my CW cistern in the loft into my airing cupboard on the 1st floor. Th twin input pump is to be placed on the floor in the cupboard alongsid the HW tank. I now need to supply hot water from the HW tank.
Wishing to avoid a Essex / Wessex / Surrey or any fiddling wit flanges on the HW tank, I could T into the 22mm vertical pipe that is th vent and HW supply for the bath. This `should` be ok. However, it woul be infinitely easier for me to T into the horizontal coming from the HW tank that connects to the vent pipe / bath supply. If I brought a downwards pipe from this horizontal to the pump would all be ok or a I asking for trouble?
Kind regards
Alun
I take it the hot water tank has been plumbed with a combine expansion and draw off pipework scheme, by the way you describe it. If you ca take outlets from the hot outlet as low down to the floor as you can, the you won't have any problems of dragging air into your pump from th expansion pipe.
Looking at the pipework you have, you should be seeing a 22 mm Equa TEE with the branch pointing toward the top of the hot water cylinder right?
The straight through part of the TEE is pointing vertically straigh up and down, correct?
The pipework coming from the lower connection, toward the floor, i the supply to the water system for the rest of the house, is this right?
So, what you need is a plan to supply the pump with constant ho water, but you also need to keep the rest of the house supplied from the sam point, right?
If all the above have been answered with a "Yes", then you reall only need to place another 22 mm TEE fitting to the section of pipe that drops toward the floor. You will be better off keeping it as low to the floor a you possibly can, but the pump is only supplying one shower that i presumably very close to where the pump is sited. Let's say, within a couple of metres?
You're running the feed pipes for the shower head in 15 mm, for both, aren't you?
If this is also a "Yes" answer, then the 22 mm pipework for the twi pump will be well able to supply the shower without problems.
I don't understand why you had to run a separate 22 mm feed from th cold tank, when you could have drawn you cold supply for the pump off th same supply that feeds the hot water tank. "
Cold supplies to shower "must" have a dedicated supply. This ensure no scalding. Not to do so is irresponsible
-- Doctor Evil