Worth mentioning that any home made heating system for hot water has to be vented to atmosphere.
I used to inspect industrial pressurised steam boilers and when they go pop it takes the street with it.
Yeah, that's why I don't like the radiator idea too much. I want a big container in which to hold the water to be in direct contact with the flames.
A domestic immersion heater used as I suggested does not need the electrical element so would be removed, voila, vented to the atmosphere. I ain't so dumb as to build a closed in system to heat water in. One would hope that most people asking questions like the OP had some common sense or are we to assume that what VikingGirl was really asking for was for someone to design and build a system for her?
There's a type of water heater they make in bits of Australia that fits to the metal tube chimney from a pot belled stove or similar that's shown in one of the Bushcraft books by the late great Ron Edwards. I'll dig it out and take a digi pic (scanners not connected yet) and put it up.
open fireplaces often had copper tanks at the back for hot water - you can still find them...
Here's a video on building a rocket stove mass water heater.
Seems pretty ingenious, with the indirect water heating to prevent boiling water or steam into the shower supply, as the water is indirectly heated by a tank of water.
Aye, got one I pulled out of the fireplace here in the scrap dustbin waiting to get weighed in.
Will take a photo later bit its nothing clever, just a copper box with a couple of fittings for 22mm pipe.
We have a a number of Hultafors Outdoor Knives with Firesteels
You can see more details here in this thread OUTDOOR KNIVES
The price is £27 and you can pay via the paypal button below.