another plug for diesel heat
Carlyle,
Your Alaskan camper project sounds exciting.
Now that you changed the propane refrigerator to 12v, there is even more reason to consider diesel hot water heat.
And wallas makes a sealed burner diesel cooktop similar to the dometic unit you mentioned to completely eliminate propane.
We just finished a 2 week trip to new england. Lows in the teens, highs 20's and 30's.
We have an espar d5 connected to the engine, the 6 gallon marine hot water heater with a coolant heat exchanger and 2 'radiators' with 2 speed 12v muffin fans.
the furnace connects to the engine using tees I added to the heater hoses.
There is a ball valve in one of lines running between the furnace and the engine.
This allows us to shut off the auxiallary heat to engine at night if desired or turn it on to preheat the engine. Because there is a valve in only one line, the radiator stills provides an expansion tank for the furnace coolant.
With this setup we can:
Heat the camper with free engine heat while we drive. It sure is nice to stop for lunch or a bathroom break on a cold dayand go into a camper already at 68F. With the propane furnace in a previous camper lunch was over just as the camper was warming up.
Heat hot water for a shower or dish washing with free engine heat while we drive. The hot water stays hot for 24 - 36 hours after stopping the engine.
Heat the camper with the diesel furnace.
Heat hot water for a shower or dish washing with the diesel furnace.
Preheat the engine with the diesel furnace.
The furnace can be controlled with a simple switch, the optional timer or a thermostat.
We have the timer so we can read the diagnostic codes and a switch that allows the furnace and radiator fans to be controllled by a digital thermost purchased at Home Depot.
The thermostat can be set up to control just fans when the engine is providing heat while we drive.
The hot water tank acts as a heat storage tank that keeps the coolant warm so when the thermostat starts the furnace heat comes out the radiators immediately while the furnace comes up to temp.
It was pretty simple to install and hook up. I bought all the fittings at Napa and Home Depot. The thermostat has to be one that has batteries for power instead of getting power from the furnace. Set the 'swing' at the maximum to allow for the furnace start up time and reduce run cycles. Keep all the plumbing below the radiator cap so the air will bleed out of the system. The furnace and radiators come with bleed screws to get things started.
With a prevoius camper that was 2 feet shorter and a 20000 btu propane rv furnace it ran constantly to barely maintain 50F when it was 12F outside and we were worried that 2 yellow top Optimas wouldn't make it thru the night.
On this recent new england trip we sat for 2 days and 3 nights with lows in the mid teens and at night the furnace ran less than 10 minutes every half hour to keep us toasty at 68F. We used about 2 1/2 gallons of diesel and less than 60 amp hours of battery.
We also really enjoy the freedom of one fuel for the engine and camper.
Again, good luck with your Alaskan camper project.
Tom