New science project for FrankenScamp - Fiberglass RV
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Old 05-18-2024, 08:15 AM   #1
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Name: JD
Trailer: Scamp 16 Modified (BIGLY)
Florida
Posts: 2,458
New science project for FrankenScamp

Well fellow Scampers one (perhaps last) project for FrankenScamp - Hot Water Heater.
Well we already have the tankless hot water heater and for space heating we have the mini-split heat pump so why the additional heater you might ask
Well if we are "boondocking" in cold weather or in the higher altitudes where it gets cold at night and there is a no generator regulation we still might need some overnight heat.
So here is the new project - adding an under dash heater like would be added to an automobile with a circulation pump to move hot water from the tankless heater with enough flow to turn on the firing circuit and produce heat to replace that transferred into the cabin area.
Here is a picture of the heater I found on eBay



I am going to try this small pump and see if it has enough flow in the heater circuit to turn on the heater and move enough water to provide sufficient heat to the system. This is a picture of the small (perhaps too small) pump I have.



And also this thermostat to control the pump or the fan.



Of course it is a little more to the system to do everything I want to accomplish. For example the circulating system would also stabilize the temperature of the water during usage at the shower and the sink and give immediate delivery of hot water at the tap.

The on off of the heating call from the heater may require a bypass valve for the heater coil to maintian circulation when heating is not needed.

Adding a switch inside for the hot water heater (outside on the tongue) that would also start the circulation pump is possible.

One small issue with the tankless water heater is that when you shut off the water for a "Navy" bath the water in the lines cools slightly, but the water that remains in the heating radiator gets pretty hot so you get some cool, some HOT (perhaps) and some cool and then the temp you wanted.

The presumed problem of wasting water waiting for hot water is not really a problem as the main delay is the water in the line from the heater to the tap you are using the heater produced hot water within a second or two, but having hot water more or less instantly and a better control of temperature would be nice.

So we have some 18,000 BTU of hot water at 8 Liters per minute and that should be sufficient as long as the pump moves enough water to turn on the flow switch.

Water temperature is proportionally controlled by the heater and having hot water being returned should not be an issue but we shall see.

I am adding an expansion tank to the system to handle the expansion of the hot water and a little more capacity to the system.

Some drawings will follow it the discussion warrants.

JD Barron

Keeper of FrankenScamp
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Old 06-16-2024, 04:53 PM   #2
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Name: Darrell
Trailer: Scamp Deluxe 16ft
Alabama
Posts: 345
Any news on the project?
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