Boiling water

So we’ve got gas on the boat and we can boil the jug like anyone else but a 3.8kg ‘Swap-n-go’ bottle costs around $30 and the last one seemed to last about 6 weeks. (We’re timing this one and so far we’re up to 18 days, although I think that person days may be a better measure in which case we’re at 38 person days)
Anyway, when we use the gas we also need to turn on a safety switch first which uses about 1.5 Amps from the battery while it’s on.

So, boiling water in the jug has a double hit from a consumption perspective, power from the batteries to hold the safety solenoid open and gas from the bottle.
Last time we were at the caravan and camping show in Canberra we found one of these

That’s a glass tube with two cups of water inside and the sides fold out as reflectors and in about an hour of full sunlight we get two cups of boiling water, no gas, no electricity J