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Can I check, do you have a current problem with the shower mixer or just with toilet? Has this always been a problem? Just wondering if some pipe work is clogging up?A few points to consider. You can feed the toilet cistern from a mains pipe but you need to check you have a ball/control valve which will handle the extra pressure, sometimes you can get a different valve unit.The shower head will work if it is above the level of the hot water tank because the HW tank is fed from the loft tank and so is at same pressure. You might have a problem if you feed cold from mains to the shower because some mixers are not designed to take differential pressure and to be honest you would still have a pressure problem on the hot feed if it is a tank height problem.If you teed into the cold main as in your diagram you would need to isolate mains and tank supplies to prevent drawback into the drinking water. So either a no return valve or separate the pipes ie no interconnection.Personally my first look would be at why you have poor tank pressure. What is the height of the header tank above the toilet inlet? Are you sure the pipes are not clogged?
, to improve my hot water pressure I was going to turn up the temperature and then hopefully the cold water flow will take the hot water with it up the shower pipe.
The drinking water is on the mains, so any mains water would be going back into mains water of the tank
Quote from: Thebox on 21/10/2015 14:52:14, to improve my hot water pressure I was going to turn up the temperature and then hopefully the cold water flow will take the hot water with it up the shower pipe. That won't work as you would need a lot of flow to create sufficient draw.Quote from: Thebox on 21/10/2015 14:52:14The drinking water is on the mains, so any mains water would be going back into mains water of the tankBut it would be going via the outlet pipe of the header tank, so the tank would fill and overflow as the water is bypassing the ball valve!.You need to ask your plumbing supplier about the tank height, is it enough for the fitting supplied. It doesn't sound high enough for me, but it must have worked at some stage? Certainly the header tank needs to be higher than the top of the shower head and 3ft above the shower head should be ok for that. Sounds as though you need to raise the tank for the shower, or fit a pump.
.., so some how I need to produce 1.5ft worth of pressure of the hot flow,
Quote from: Thebox on 21/10/2015 15:47:19.., so some how I need to produce 1.5ft worth of pressure of the hot flow, If you raise the header tank this will also provide more hot pressure as the hot tank is fed and pressurised from the header tank.
You should be able to buy capillary adapors for joining 15mm to old pipe. But if you use compression fittings 15 will fit old 1/2 in, but to connect 22mm to 3/4 you will need to ask for an oversize olive.You don't need to know mass of water to work out pressure. Just distance between bottom of tank and tap in meters. 10m=1bar so 2m = 0.2bar etc. compare this with tap spec.You won't be able to siphon hot water up the shower, not good physics