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Old 04-30-2011, 10:55 PM   #11
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I work for utility and I asked someone in our marketing dept. that I know, but this was for home usage, and she adviced me against it but I am all electric except for butane gas logs.
"Curiouser and curiouser," said Jeannie (apologies to Lewis Carroll). I used to work for an electric and irrigation utility and they pushed them for home use since they save energy.

I'm in Prescott, AZ, right now. The local Jayco dealer, Affinity RV, is having a big sale and RV show which includes several seminars, one of which, interestingly enough, was conducted by a rep from Gerard. Seems Gerard gets their low price by dispensing with the expensive gas controls that the more expensive Precisiontemp RV 500 uses to control water temperature in varying water flow conditions and controlling the Gerard unit's water temperature by having the user adjust water flow. A workable albeit odd concept for showers and washing hands but methinks it would not work well with a clothes washer. He did have a demo unit set up and it put out plenty of hot water for a shower through a generic shower head. When fed through an Oxygenics shower head and there was more than enough for an almost scalding hot shower.
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Old 05-01-2011, 01:03 AM   #12
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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
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Old 05-01-2011, 09:08 AM   #13
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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.
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Old 03-09-2012, 05:28 PM   #14
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Gerard estimates one pound of propane for three hours usage. That is a lot of showers with no waiting.
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Old 03-12-2012, 03:05 PM   #15
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Gerard estimates one pound of propane for three hours usage. That is a lot of showers with no waiting.
Sorry for taking so long to do so but thanks for that info. I had just about decided against getting a tankless water heater (I would have gone with a Precision Temp RV 500) because I'm getting to old to wrestle with 30 lb. propane tanks. I checked the specs on Precision Temps' website, did some number crunching (poor numbers ) and, if I go with electric heat, then I could get away with replacing the 30 lb. tanks with more manageable 20 lb. tanks. Depending on how often I used gas for cooking or BBQing, I could go a month on a single tank before having to refill (having dual tanks with an auto-changeover regulator would let me pick my time to refill an empty tank).
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