You could fit a radiator/towel rail with an electric element in it. We had one in an old bathroom. They are meant to be plumbed to the system, but I just capped the in/outlets and ran it stand alone.
Oh interesting, not even thought of that. So filled with water then sealed, and running immersion? Food for thought that
Yeah that. There are plugs on the top of rads so you can get all the air out of one as you fill from the other.
@C4r1s started
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You could fit a radiator/towel rail with an electric element in it. We had one in an old bathroom. They are meant to be plumbed to the system, but I just capped the in/outlets and ran it stand alone.