Crosswords71 mins ago
Bath mixer tap with shower attachment
I have replaced my old bath taps for one with a mixer with a shower attachment. I know the temperature won't mix great due to low pressure hot water from the tank and the cold water from the mains. However, the water comes through the tap with good pressure but when I switch it to the shower head the hot water doesn't come through well at all even with the cold tap off. It just dribbles. The cold water comes through reasonably well as expected.
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The hot water pressure relies on the water pressure from the cold water tank in your loft, whereas the cold water is (usually) from the mains. To see if this is your problem, set your mixer to full hot, then raise and lower your shower head. If the flow reduces as you raise the head, then you have an insufficient head of water above your shower head. If that's the case, your only answer is to raise your loft tank. Or spend loads of dosh on a power shower pump.
From your description I would say there is something odd about this - the hot water on its own runs fine into the bath but on its own through the shower hose held at tap level it merely drips. My immediate reaction is to thing there is something obstructing the water from getting from the tap to the shower rose. I suggest you remove the hose from the tap (assuming this can be done) and see if you get hot flow on its own. If not, knowing the bath-filler spout is at more or less the same level as the fitting (on top ?) for the hose, then the switch from bath-fill to shower is not working correctly. If you get similar flow (hot only) through bath-fill and hose fitting, then your problem is either in the hose and rose part, or else at the joining onto the fitting (washer scrunched up ?). The way to test the hose and rose is to run water through it by offering it to the bath fill (letting it lie on the bath bottom) and simply filling it and watching what comes out at the other end.