Thanks for those suggestions guys, the 3 channel controller may work however it seems to only provide less than 3A per output channel. I think I would need at least 4A for a dew heater (48Watts).
The motor controller looked exactly what I needed until I read it operates off AC voltages up to 240V. Do you know if you can drive it with 12V DC?
But I will do some more research on them and there may be a 12V version available.
Cheers
Bill
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