Hi Mick
I am using a GME PSA126, 7amp Peak power supply with a Digifire 7 Controller. I use a length of 20amp automotive cable with female cig holder on the end, I run up to 3 heater strips with no dramas at all.
I use this power supply only with the Dew Heaters and Controller so as to prevent any type of groundloop with other 12 volt accessories.
Cheers
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