OK all you who have done this already….how big of an LP on-demand water heater do I need for my trailer build? We are setting it up as a full catering mobile kitchen. I know the flow rate of the water will affect temp, so if I’m using a 12v pump (gotta buy that too – wasn’t there a recent post?) how how can this water get using one of these fancy new heaters? I don’t mind cutting a vent if I need to do that for lotsa heat, so if you folks have some suggestions on various brands or sizes, please tell! I need to order this stuff soon so it’s waitng for us when we go pick up our rig.