Photax made heaters for black and white as well as colour work.
The one for colour work had an element that took more watts, and so was capable of higher temperatures.
I have a colour heater,
COLOUR STAR 3.
300 watts 240volts, ac.
26" x 10.5".
Off the top of my head I think the black and white equivalent was 109 watts.
Make sure you get the correct one for your chosen process. I have to give short bursts of power to my colour one when doing black and white, as the lowest setting gets way to high for black and white chemicals.
I find it invaluable at this time of the year in the UK.
Cheers.
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It will all be over by Christmas.
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