Alde Thermostatic Mixing Valve (TMV): how to fit

Start by finding the hot and cold feeds to the shower (or whichever outlet you want).

1. Looking at the TMV unit, the water inlets/outlet form a ‘T’.
2. Cut the hot water feed and using suitable connectors join the feed from the boiler to the arm marked ‘H’ (hot).
3. The other end of the hot water pipe (the one that goes to the shower tap) needs to be connected to the bottom of the ‘T’ (you’ll see an arrow pointing down to this in the brass casting).
4. With the hot water connection made, you need to inset a ‘T’ connection into the cold water supply to the shower tap (so that cold-water can still be fed directly to it). To that ‘T’, make a connection to the ‘C’ (cold) arm of the TMV, thus you’ll have a hot and cold feed to the arms of the TMV with a mixed water outlet from the bottom of it.

• With your water system filled and the hot water up to temperature, turn your shower tap to its hottest setting and turn the water fully on.
• Once the heated water starts flowing at the shower head, it should remain at a constant 41°C.

Should you want the maximum temperature of the water at the shower head to be cooler:

• Pull off the red cap on the TMV (which has a triangular ‘hole’ in it) and using that on the triangular head on the TMV (underneath where the red cap attaches),
• Turn the red cap clockwise little by little until you reach the desired shower head temperature. Conversely, if you want it hotter, turn the valve anti-clockwise.
• Make small adjustments and give the new temperature time to get to the shower head before adjusting it more.

When the temperature is right, replace the red cap, and that’s it.

The TMV will regulate the maximum temperature, but if you want a cooler shower than the maximum, simply turn the shower tap to the desired setting.

You can now be confident that the water temperature at the shower head will be both constant, and that there will be no accidents with hot water.

Nigel Hutson

Nigel Hutson, a lifelong caravanner from Chesterfield, Derbyshire in England. Purchased his first caravan in 1984 and has since then toured the UK and Continent on a regular basis, alongside his wife Kay. In addition to being a husband, he is also a father and grandfather.

Since retiring from the police in 2011 Nigel has become a regular contributor to various caravan and motorhome publications, as “someone who enthusiastically writes about their hobby rather than a journalist”. Nigel is also a keen musician, enjoys travelling and has a great interest in all forms of transport… and he is a Manchester City fan.