Build Instant Hot Water Heater.

Sounds like you're on the right track to me. Much quicker than my 5 gal ss beer keg storage unit.Fidei defensor

Rosco

g'day just fitted a helton shower unit to 100 series. believe they make hw units as well. do a buisness search for helton in brisbane.

Boil the billy.......better still, buy a 12 volt electric kettle for about $15

Cheers,
Willem

Googs Lake camp

Gibbsie,
Looking at same currently, best I can gather is 1/ Primus or Aussie Shower flow through units, about $400, 2/ Caravan type storage heater for $500, 3/ "Boiling Billy" 20Ltr can, avaliable in Melbourne, about $50. Fill with water place on/near campfire/stove, when hot, top up with cold water and hot water flows from spout. I'm not 100% happy with either system and don't want to run a unit in the vehicle if possible. If you have a better design let me know!
Rolande

gday gibbsie.
easiest way is fit a heat exchanger(i use helton)
fit it on and no more cold showers/dishes water
a little over $100 not worth messing around your self i reckon.
cheers
due to duck season coming
ive decided to hide out
love jemima puddle duck
back after the season

Your idea should work, but be VERY careful not to create a sealed system. In other words, make sure you either create an open system (even with the tap closed) or at least have a reliable pressure relief valve in the system in case it overheats and the water turns to steam. I have seen the results of a domestic hot water system that literally exploded and destroyed half the house because of excessive steam buildup and the relief valve jammed. Don't want to put you off, just be aware of what can be created unknowingly without some careful thought.

Cheers
Gerry

As a plumber ga/fitter I back up what Gerry says about being very careful trying to make a DIY wter heater. I've seen water heated by the sun in black irrigation tube flash to steam when the pressure has been removed with very nasty consequences. I'd buy a ready made unit and be safe.

Gibbsie

have just completed making an all copper heat exchanger connected into engine cooling system and it works a treat. all hardware brought from local scrap steel merchant, including connections at the low price of $38. All that is needed is a little oxy welding know how.
350 mm of 75 or 100 mm copper tube
4 to 5 meters (i used 1/4 in ) copper tube
2 copper T's to suit heater hose
2 1/2 in to 1/4 in copper reducers
The wife is happy with it, so that all that matters
Hope this helps

MIK

Gibbsie,

Mate have I got a deal for you. Buy my steam launch, ooodles of boiling water and you can fish or explore as well, seriously tho if you like I could email you a sketch of exactly what you want but you are on the right track anyway. another solution is to paint a 20litre drum matte black and carry it on your roof or just leave it out in the sun... even in winter & in about 4-5 hrs you will have 20litres of water at around 40 - 50c.