The not-so-creatively-named Hot Water On Demand
has been discussed before, and it does look like an interesting system to me if that's all you need. I believe that it was designed for tent campers and the owner's manual
says it is for outdoor use only; I think Benita's comment about this point is valuable insight from someone who has actually used one (I haven't).
I think the bulkiness comes from the need to contain the propane
cylinder, water pump, and battery
, in addition to the actual heater. If I had these things already in my trailer (electric pump and battery
or hand pump, propane
tank for stove and/or space heater) I don't think this complete system would be the optimal way to get hot water inside
the trailer. I'm surprised that they offer the option of using a hose to connect to a bulk propane
tank (instead of using the disposable cylinders), since Coleman doesn't offer that option for their catalytic heaters. Since it is a high-pressure setup, I believe that the hose kit would not be suitable for use in the trailer anyway.
power (AC or DC) is
required eventually to recharge the built-in battery
so that the unit can pump water.