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thanks for your help again i will line up pipe 1st. what do you mean screw it on loose then mark the screw holes? what do i screw it onto 1st?... should i line up pipe, mark holes through unit, then remove drill and plug and reift??

i believe they can be ran from the tank but if they mix in the body at different pressures (ie cold mains and hwsv gravity hot) then they legally require single check's on their supply pipes)

the OP said only when bath or basin taps are opened the overflow occurs though ....

fair enough. good to know. i just thought that all taps fed from a cold water tank now had to have potable water at cold side due to regs!!

they must be the type that mix the water in the body. fit check valves but when both hot and cold are on together you may get more cold than hot! may be ok though. other than that it's new taps that mix at the end of the spout.

must be an older mixer tap that mizes water in the body, which is illegal now i believe without a check valve on both hot and cold pipes?? unless the mixer is faulty and passing, and as the cold mains ispowerful, is forcing the hot back up to the h/w cylinder and the cwsc and out via the...

Thanks seco services, I have already bought a new shower so will replace it tomorrow morning whilst off all day :) Thre doesn't seem to be any blackened marks... could the elment just have failed/burned out as i first suggested? As the original was a horizontal rear entry, is it fiddly to...

so this happens with both mixers or just one of them when opened on both hot and cold? has this only started happening? you could possibly fit a check valve in your supply pipes to the mixer(s) but then again ideally you should have balanced supplies at taps/mixers.

are the cold supplies to the mixer bath and basin taps fed from the cwsc or fed direct from a mains supply pipe? is the pressure at the cold a lot more powerful than on the hot side to them?

is the cwsc above the cylinder constantly re-filling?? listen for splashing water sounds...

probably a faulty mixer tap then. does it happen when you open a hot tap or all the time even if the hot tap is closed? edit: if ht e smaller tank is higher, could be a hole in your hot water cylinder. is the water from the cold taps fed from the cwsc dis coloured?

thanks for your help seco services. so is there anyway i can test for a faulty tco? can that be replaced on its own? why would the tco go? is there a reason why it has? i bought some toggle clips today from B & Q to use but guess i can take them back then. It is just that the screws and...

from what i know, that is normal as on heating up the water in the cylinder expands a little bit and thus goes back up the cold feed pipe and into the cold water tank.

Hi seco services, yes the wall is tiled but it's not a solid wall, and i think the original shower was installed using a toggle clip type fitting possibly? will normal raw plugs be strong enough to hold it up?? what do you mean by a faulty outlet tco? Is this to do with the element...

Hello everyone. I have a few questions if anyone could please help me to answer: I am replacing our electric shower (tritan ivory) with a new electric shower as it is not working, i suspect the element has burned out as the water runs just cold all the time and the pressure switch seems to...