Originally Posted by snbbaxter
Pros and cons???
This was from a previous post by a different poster but covers it pretty well...
"You can not even mention residential on demand water heaters and rv on demand water heaters in the same sentence.
Residential is instant on, rv has a 30 sec. time delay every time plus the water temperature rises very slow over 15 to 20 sec. or so.
If you have a washing machine in your rv that takes small bursts of hot water you'll be out of luck, it simply doesn't work.
If you have a dishwasher hooked up on hot water, same deal.
If you're in the shower and someone opens any tap anywhere the water flow is being reduced to below the threshold of 1/2 gpm. the water heater shuts down.
You pay for propane even when you pay for electricity at the campground.
Trying to conserve water? Forget it, you can't shut it off while you wash your *** and turn it back on expecting to come out nice and warm, no it will be ice cold for the next 40 seconds.
Another huge problem, especially for fulltimers, can be calcification of the heater tubes which is not nearly the problem in a conventional hot water tank where you have easy access from the outside.
On the plus side, your rv weighs about 50 lbs less, depending on the water heater size.
I apologize for the rant, but this is our personal experience with the Girard 2nd. Generation and FR has authorized our dealer to replace the on demand water heater with a conventional hot water tank."