LP gas Diagram, help needed.

evy wrote:

westend wrote:
Careful with those unvented heaters in small spaces. I, personally, won't use one. Doesn't mean you can't. Yes, they operate at higher than 11" WC. That's also true of portable BBQ's. You could try to remove your BBQ regulator to make it work with the tank system's pressure.

Even if the heater has a low oxygen sensor and a LP/CO alarm would be installed, you still wouldn't use them?

No, and since you ask , I'll explain. Even with a new heating element, certain petrochemical effluents are being introduced to the cabin. Along with that, CO, CO2, and a large amount of water vapor are produced. Oxygen is being deleted. Without an exhaust, all of those are in the air you breathe. I choose not to breathe those things.

FWIW, I have a conventional travel trailer. I replaced the standard furnace with a Sportsmen heater (basically a tin can with a gas ring inside). Exhaust plenum stack air and combustion air are piped in from the exterior. A conventional Class B gas exhaust stack exits the roof directly above the heater. This is the third RV that has used this same heater. It is no longer made but there are similar fish house heaters that have an exhaust stack or there are wall mounted gas heaters that directly vent to the exterior. All of these are superior to a heater that spews exhaust in the cabin space.

If you have your plans set on a Mr Buddy heater, remember to open a ceiling vent and also a window as the instructions require.

For the amount of space you will have when done, I would seriously consider a hydronic system. You are going to have a water heater, correct? A heat exchanger, a small pump, and a small draw 12 V fan with tubing and some pipe fittings is all that is required.

A half-way proficient engineer could also design a second hot water loop from the engine to use all of the engine's mass to harvest some heat for the cabin. When underway, the cabin could be heating and after engine shut down when engine temps reach 100f or so, a relay cuts that loop with a TC valve and the water heater takes over. I will send an address to my firm so that initial invoicing can be done, lol. :B