M67 immersion heater documents online

[Julian]

You wouldn't need a large mass of water in the yurt, just a radiator - otherwise you're wasting valuable yurt space. I imagine hep2o would be the way to go for the piping. Sounds like a fun project!

Having been given 200l of red diesel I've got even more coming my way - it's all free heat in the M67.  Any misfuel would work a treat

the problem with doing that is i would need to run a pump continuously. i am on solar with  genny backup  so  running anything continuously is not always possible. running a 12volt pump for 7 minutes is much more feasable. once the drum in the yurt is full i tranfer the pump to the yurt drum ready to transfer the cold water back again. the drum with the m67 in will be insulated with 100 mm of celotex. which is insulating the coach at the moment. thermal mass  is the idea,as in
 the rocket mass heater.

What about a series of Pletier cells round the drum to drive the pump?  If it's just circulating a short distance it only needs to be tiny.

[greasemonkey]

I think you would get thermal circulation with a rad, from a 205.
The water will be cooling pretty dramatically once it reaches the rad.
The only thing I can say is, I don't know exactly how much water my central heating system holds, but it isn't long after turning the boiler off, that the rads start cooling. After all, a rad is designed to loose heat in the most efficient manner.
Another other thing to consider may be one of these baffles that the heated camping brigade use.
They get their flues mega hot, and just have a heat proof baffle taking it out through the side of the tent.
Next time the discussion comes up on one of the outdoors type forums, I'll try to remember to post a link. Won't be long, what with winter approaching.

[photoman290]

dont think it would thermo-syphon as   both barrels would be at the same height. i could try burying the outside one ,that may work if i can get down far enough  with out hitting granite,not too likely around here.
still think heating the water and transferring  it fast is the best option all the others mean losing  some heat to the outside. 2 ibcs and one barrel would be the way to go but suspect that would meet with disapproval, unless i disguise it somehow.

[Bio-boy]

I'm currently looking at an M67 as a means of utilising my Bio to heat my daughters swimming pool. However, I have a few questions.....
a) Do you need to start the M67 using petrol or will Bio get it going on its own?
b) How easy are they to light? Are they temperamental or straight forward to light?
c) How long does a full tank of fuel last?
d) Are they economical or thirsty?

[Dickjotec]

I don't use a M67 for the hot tub but a normal oil boiler running on bio with a heat exchanger. On bio the boiler is automatic with a couple digital temperature controllers and a timmer to control the temp in the tub and the whole system is hands off.

[dgs]

Yes, I was going to say using an M67 as swimming pool heat does work (bbb) but doesn't give a lot of control, especially if left unattended.

Rob, you can use virtually any fuel but avoid wmo because of the residue build up. They are very easy to light and economical to use. Re fuel consumption, the tank is about 5 litres and I would say it would last 2 hours ish on high. If you turn the fuel tap down to a drip every few seconds it will last hours (probably overnight) but doesn't produce much heat on tick over.