Hi Joe - I have infact answered my own question and found out that a 3kw hand wash type heater can be connected to a normal mains supply with an appropriate fuse and switch. I will be washing prints in the darkroom, and with summer main-supply water temps at about 16 degrees and dropping in the winter, i definately do need something to heat it up.

so it looks like a 3 kw hand heater is the way to go, my only concern being that it isnt really designed for prolonged use, only quick bursts, so this may be a problem???