Shower mixer installation

Hi Recently bought a Trevi Therm shower mixer. For the inlets into it for hot and cold water and the mixed water out, there are 22mm compression fittings. As my hot and cold pipes into it are 15mm would it make any difference if I used 22mm to 15mm reducers in the fittings. I am just wondering if there is a reason why they have used the larger fittings. There is also a Trevi Xcite fixed shower head which has a 1/2 BSP male fitting.

Jack

Reply to
jack
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Not totally up to speed on the design of the Trevi Shower system, but reducers on the shower shouldn't make much difference as long as the pressure of water is OK for the height of the shower head. If the pressure is not enough to create a good flow from the shower head then you may need to install a pump on the outlet side of the mixer valve to help draw water through the system. or you may need a twin impellor pump on the supply pipes to help push the water up to the height of the shower head to create a good flow rate for a decent shower.

Reply to
BigWallop

There is plenty of pressure in the feed pipes. The hot is fed from a floor standing Worcester-Bosch combi boiler which is installed upstairs, as will be the shower. The cold is direct from the rising main. With the pressure we have there should be a good power shower. I was just curious as to why there were 22mm compression fittings supplied

Jack

Reply to
jack

The 22 mm is there for the pressure reason. The bigger the pipe inlet, the more flow rate through the pipework. but if you're drawing water from the mains then you shouldn't have any problems.

One small word of caution though. Remember to balance the flow on both supplies. This is easily done by turning the hot supply fully on and setting the mixer valve at the mid point on the dial. Feel the water temperature. It should be really hot if it is coming direct from the boiler. Leave the valve set to the middle position and the hot supply fully on, then slowly turn the cold on until the temperature of the water reaches a comfortable level for a decent shower.

Balancing gives you a better range of control through the mixer, and because the hot side is running through the boilers heat exchanger it loses some of its momentum before reaching the shower. The cold supply coming directly from the mains pipe is less restricted so doesn't need to be on as hard as the hot.

Good luck with it.

Reply to
BigWallop

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