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Valve cosy for hotter water and energy savings

During the week I was lucky enough to be given a sample Valve Cosy.

A valve cosy is an energy saving and safety device that covers to hot water outlet from a hot water heater.

Where the hot water pipe leaves the heater is a point where energy is lost from the heater.  This means cooler water in your taps, and the hot water heater has to run for longer to reach the right temperature. Well, that's the theory anyhow.

Hot water outlet pipe from gas storage heater

The Valve Cosy itself is hard plastic, with a polystyrene type lining and foam around the pipe holes.

Inside a Valve Cosy
 It took about one minute to read the instructions and clip the cosy around the heater outlet.  The outlet is hot, supporting the claims about energy loss. The official page on their effectiveness shows that they appear to contain heat energy within the insulated cosy.

Valve Cosy fitted to the hot water outlet
However, I noticed that the cosy easily moves - in my case it isn't a tight fit against the hot water heater. To me, that suggests its effectiveness is reducing energy loss from within the heater is minimal and it may not leave to savings in gas consumption. It does wrap around part of the pipe, which might lead to warmer water in the house.

Loose fitting Valve Cosy can easily move away from the body of the hot water heater
To tighten the fit, I may need to wrap a thick layer of tape around the pipes, to increase their diameter.

Valve Cosy's are available from Reece, the Alternative Technology Association and some sustainability type stores.


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