1. Decide where to take the hot and cold water supplies from
Initially, you’ll have to decide where to take the hot and cold water supplies from. If your shower is being fit above the bath, you can tee into the faucet supplies. If you are installing the thermostatic shower valve into a shower enclosure, you can tee into the nearest hot and cold pipes, which are typically found under floorboards or concealed within a cupboard. Trace the pipes back from the closest hot and cold bathroom faucets to check which is which. The water flow can be felt through the pipe when the faucet is running. Run each faucet in turn – you’ll be able to identify the hot water pipe as it heats up quickly.
2. Isolate the supply
After deciding where to take the hot and cold water supplies from, the work can begin, but only once the supply has been isolated. To do so, turn off the stopcock (usually found under the sink), and open the hot and cold faucets to drain away the water within the pipes.
3. Run the pipework towards the shower
After the supply has been isolated, tee into the hot and cold supplies and run the pipework towards the shower. Following the instructions supplied with the valve, feed the hot and cold water supplies to the correct sides – hot is on the left with cold on the right.
Top Tip: plastic pipe can be run under floorboards and behind stud walls for a hassle-free plumbing solution. Use pipe inserts at any joints to prevent plastic pipe from deforming.
Use a shut-off valve on the hot and cold supplies as close as possible to the shower. It is easier to tighten up compression-type joints on a copper pipe, so slot a section of copper pipe into the end of the plastic pipe runs. Once this has been done, place the plastic stop ends on the pipes, turn the stopcock back on and check for leaks on the new pipe runs.