[Stephen burton]

With winter approaching its my first winter using wfp, what is the best way to keep the water from not freezing in the tank

[Clever Forum Name]

Antifreeze 

I use two duvet's and an oil fired rad. Warmer than my house.

[Shane sharples]

Which tog duvet do you have?
Your oil rad, do you have it on a timer plugged into an extension over night?

[Smudger]

Vans are parked inside 

Oil fired rad was always adequate to stop freezing ( left on overnight just above the frost protection setting.

Or install an immersion element, that will stop freezing and give you warm water the next day

Darran

[Clever Forum Name]

Which tog duvet do you have?
Your oil rad, do you have it on a timer plugged into an extension over night?

13.5 

No timer. Just above frost stat.

[Small but perfectley formed]

polystyrene  boards cost me about £30 to insulate Peugeot expert last winter , never had to put heater in.

[DeLuce]

I've put thermal insulation board round mine, the 1" thick stuff. While tank was empty I put cut piece underneath and then on every other side and the top. Easy to cut round tank filler and also fitted immersion. It's a decent set up for a decent price.