Originally Posted by yddad45
Like I said my contact that sold them for my company and I am talking major utility, Word was, they would be economical for a camp or someplace that does not require hot water regularly when you call on them to work they call on you utility meter.FYI hope this helps
Frankly, I'm surprised that a utility would take that stance. Tankless water heaters have been in use for years in Europe. The early units had a low yield but modern ones put out plenty of hot water. The ones available in the US for conventional homes are definitely more efficient, especially when hot water use is sporatic. How often do people actually use hot water? One or two showers a day per person, two or three loads of laundry a week, wash hands half a dozen times a day for about a minute each time, and wash dishes once a day. the rest of the time, no hot water is nneded or used. So why waste energy keeping a 30-50 gl tank piping hot, ready to use? When I was working, I would be away from the house 10-12 hours at a time. No hot water was being used. I don't use hot water when I'm sleeping. Why heat water during those times? Even now I'm retired, I'm still using the same amount of hot water. It just doesn't make since to keep a tank of water hot just so I can use a gallon or less to wash my hands, especially when I can have the water heated on demand.
While actually operating, more energy is being used to to heat the water than a tank unit for the same amount of time. The difference is, the tank unit runs longer because it has to maintain the water temperature at all times, whether you are using it or not. While idle, tank units lose heat, no matter how well insulated, so the water has to be frequently reheated. The tank unit winds up using more BTUs to keep that idle water hot. The tankless runs only when you are drawing hot water. The rest of the time, it uses no energy. Tankless units use more BTUs per minute thn tank units because the tankless units are heating the water faster. The actual number of BTUs needed to heat water to a certain temperature remains the same.
It may be that electric tankless units do not compare as favorably to electric tank units as gas tankless units do to gas tank units (gas provides faster heat than electricity does) but RV tankless units are propane powered. Someone who camps where the electricity is a flat rate lumped in with the space rent will save money with a tank unit. However, they will still have a limited supply of hot water at any given time. I want to be able to have unlimited hot water for long showers (and possible multiple showers, one right after the other when I have company or do something insane like get marrieed), washing clothes and dishes, etc. dishes, and to not have to wait for the tank to reheat. Since I will probably be living where the electricity is metered, I will probably save money.