I was struggling with keeping my washs warm during the winter months. Various heating pads and blankets may work OK for some but for my 4 @ 25L + 1@60L collection of brew barrels felt some thing different was required. I eventually decided on copper heat exchangers (wash warming wands!) powered with warm water to in directly heat the washs.
Here is the setup.
From left to right...
* Orange box is a low voltage %v & 12V) power supply for the pump. Home made decades ago.
* Cheap slow cooker as a water heater. 12V immersible pump is inside.
* Dual thermostat. Modules from ebay. The water heater is only turned on if the brew tem goes below 27.5C and heating water is below 32C.
* 4 X 25L brew barrels wrapped in a couple of old doohnas. Each contains 20L wash.
The water heater and 12v pump. Upper wire is a temperature sensor for the thermostat.
Wash warming wands.

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