DIY radiant heat system

[seayaker]

I'm exploring the possibility of making a radiant floor heating system for a RV or van with a propane tankless water heater. I've been using a 12 liter per min. heater in a RV for years and am very happy with it. I just wonder how efficient it would be if I got a water pump and some pex tubing and made a closed system. The heater seems to be very efficient for my hot water so I just wonder if it would be worth while to make a heat system. I like the idea of having the heater outside where no fumes would get in and pump the hot water through the tubing. Any thoughts on how efficient it could be. I'm not at the point to do mathematical calculations just looking for a semi educated guess.

 

[seayaker]

Engineers with hobbies forum? I don't know where that is. I was about to close this thread when I got the add for diesel heaters. The photos are just examples, I'll probably try to find something in a scrap yard to use for an exchanger and pump set it up and see what happens. The heater does have some adjustments, if I can get it to run for 10-15 min. and see what kind of heat I get from the radiator I'd have a good idea if it could work or what I need to do.

 

[LittleInch]

Here https://www.eng-tips.com/forums/engineers-with-hobbies.1528/

The heat and the other things can all be calculated. Far better to design it right then test it.