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Where the radiator valve is often covered with a towel,clothes,curtain,etc., It is better to remote sensors. Because of the heat in bathrooms when you use , and towels or clothes on radiators affect the trv, because it was not practical to put trv, bathroom towel radiators used to be used as heat leak rad.
 
The wattage of the electric element can be anything from 100W to 1000W depending on the size and model - the wattage of yours will be stated on a label somewhere. Around 250W to 300W is fairly typical, which is very roughly 3p or 4p per hour to run. So £1 per day if left on all the time.

Another thing to mention about the TRV when running from the central heating is that when your bathroom gets lovely and warm because you are having a bath, the TRV will turn the towel rail off. It's a thermostat - that's what it is for!

Of course the best way to avoid wasting money is to turn either the electric or the rad valve on only when you need it.
 
it depends on what the main use of the towel rail is? heating the room then fit a trv. your builder is incorrect about the rail being a bypass, your system should have a automatic bypass designed into it. Sometimes its in the boiler but i always think its good practice to fit one on the system even if the boiler has one.
 
i your system should have a automatic bypass designed into it. Sometimes its in the boiler but i always think its good practice to fit one on the system even if the boiler has one.

Is it a regulatory requirement to have an automatic bypass on new systems?
 

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