Why does my bathroom radiator get hot when the hot water is on?

Some plumbers would connect the bathroom rad to the hot water to save time instead of having to run pipes for the hot and cold water as well as central heating pipes. I have never used this short cut myself.

I know that when all the radiators go on with the hot water it is a faulty diverter valve. This diverts the hot water from the tank to the radiators. And when its seized open the radiators get hot water too. Maybe its possible that its not closing completely and the bathroom radiator, with it being the closest to the tank, is getting some hot water?

I would suggest the cheapest option, if its a problem, would be to turn the bathroom radiator off or partially off so its not too hot in there!

This is common in older heating systems, the bathroom radiator was often piped up to the hot water circuit to help stop condensation forming when using the bath.

you opt for to take gravity bypass and returns from the cylinder to the radiator accurate and bottom tappings, relies upon on the top of the cylinder no matter if this is going to bypass??!! you may want to extra healthful flanges to the cylinder. you need to merely use a non-ferrous radiator, copper, or a particularly lined metal form or you receives rusting on your warm water, which will come out of your faucets. this also will use a number of your warm water, via radiation. safer and affordable to extra healthful an element to a panel rad. or use a Dimplex towel rail.

If you have a stainless steel ,towel heating type radiator it could be connected to your hot water storage on purpose,,this allows you to have dry, warm towels all year round when central heating is not on and is not unusual