Eberspacher fuel consumption

We’ve just spent 4 days on board, plugged in, using electric heat. Outside temperature was -3 at the lowest and 4 at the highest. We’re 2 adults and 2 kids on a 32 footer. We have two small oil filled radiators and a fan heater, and ran a dehumidifier pretty much all the time as we’re cooking on board etc. Add in electric kettle and the usual gadgets. Electricity usage was around 30kwh a day, or around £6.60 a day.
 
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I have a chinese diesel heater and as of this evening it has used 60L in the last 14 days (give or take a few ml) - thats with temps hitting -4 at times and the marina is frozen (lots of fresh water flows through)

We have a 50 foot cat so its a big volume to heat and the insulation is 20mm foam under the wall coverings in most places - I built it to keep heat down in the tropics not heat in in a miserable cold UK :( In addition we have a 400w electric in the heads to keep that warm and dry separately. Boat is 1000sq ft though internal volume is smaller

Diesel heater is on 24/7. Maintains 20 degrees from 8 am til whenever bed time is -2230 normally - and then goes to 10 degrees overnight to keep things dry and warm enough but doesn't keep it too hot to sleep or waste diesel on higher temps when under a kingsize feather duvet ...

60L at 100% heating rate costs about £51 so (and last year shows this to be accurate too) around £100 a month in December, January and February, and perhaps half that in November and March. Being a cat we have a lot of windows which is also bad for insulation but great for heating in the last few days of sun and bitter cold . Sits at 20+ degrees in the cabin with the door open (to the "greenhouse cockpit) and heating at the lowest rate using 0.14L an hour - so 10p an hour .

I keep thinking of adding Aerogel insulation above all the ceiling panels and maybe into window blinds but the cost of the insulation alone would pay the heating bills for about 15 years so...
 
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