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Tool Talk Discussion Forum

Renni tankless water heaters

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Bret4207

06-02-2006 06:25:02




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Anyone ahve any opinions on theis brand of tankless heater? My propane dealer carries them and says good things, but why wouldn't they if they're trying to make a sale. I like the idea, just not sure if they work.




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Stephen R. Horton (TX)

06-03-2006 19:16:58




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 Re: Renni tankless water heaters in reply to Bret4207, 06-02-2006 06:25:02  
We have 2 of them that run our whole house. Sor far, they're great, but we've only been in this house for a little over 2 years. We did quite a bit of research on them before deciding--stay away from electric, unless you own your own electric company. Everything else in our house is electric; these are the only propane consuming appliances. Last year we used about 100 gallons of propane, and we're pretty liberal with the hot water. Also, we have low flow faucet heads on everything, but we've got enough volume to run both showers, the washing machine and the dish washer at the same time. Go for it. -Stephen

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Bret4207

06-03-2006 05:04:44




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 Re: Renni tankless water heaters in reply to Bret4207, 06-02-2006 06:25:02  
Thanks guys.



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504

06-02-2006 16:35:32




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 Re: Renni tankless water heaters in reply to Bret4207, 06-02-2006 06:25:02  
Bret,I have a Bosch tankless in the house. The only thing I have against it is it has a varibal(sp)water valve(the more hot water you use the slower it comes out). The Rinni has a varibal flame(the more demand the higher the flame). BTW, I have had it for 3 years and I`ll never go back to a tank. kjm



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Foz

06-02-2006 15:07:44




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 Re: Renni tankless water heaters in reply to Bret4207, 06-02-2006 06:25:02  
Don't know about the Renni brand in particular. Have run service for both point of use and the whole house type. I believe the point of use type has its place. The whole house type (electric)I wouldn't take ,if you gave it to me and installed it for free. I have run power for 6 of them....and within a year each customer that HAD TO HAVE THEM..wanted me to unhook them and throw them as far as I could!! As for the gas type....I just ran pilot power for 4 of them. Time will tell about them. They're not cheap.If you have hard water it will play he!! with them. If you have plenty of money to gamble with ...go ahead.

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jdemaris

06-02-2006 13:23:34




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 Re: Sometimes a waste of money in reply to Bret4207, 06-02-2006 06:25:02  
Do your research before buying any tankless heater. They can save you money in the long run - but it all depends on your usage. In some cases, it does not save ANY money as compared to a tank heater, and in the long run, can sometimes cost more. Keep in mind, a tank heater is cheaper to buy, and - if very well insulated - it takes very little to keep the water warm. You cannot believe everything Paul Harvey says. You may be better off adding insulation to your tank heater - or adding some sort of passive solar if you really want to see some savings. If you have cold well-water, simply adding a pre-tank that warms up to room temperature can help a lot. Tankless heaters often DO save money if you have a spot that needs hot water and is far from the tank heater. Again - do the research and the math. It takes X amount of energy to heat the water - regardless of what type of heater or fuel is used. Then - the question is - how much extra energy do you use to keep the stored water hot - versus how much additional exspense is involved in buying, installing, and maintaining a tankless. I know in my situation, a tankless heater as a main hot-water source would be a waste of money. Also, keep in mind -that most tankless heaters will NOT sense incoming hot water. So, if you preheat with solar or wood in the winter, it will be a waste - the tankless will come on anyway. There are "special" tankless heaters that DO sense incoming hot water instead of sensing flow - but they cost even more.

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George in Biloxi

06-02-2006 11:05:17




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 Re: Renni tankless water heaters in reply to Bret4207, 06-02-2006 06:25:02  
Hello,
I do not really know about the gas types. However, I did some research into the electric types and thought I would save some money. Well, they have 150 A service at the heater (for a whole house type). They say they save money becouse it only heats what you need and does not work to keep it hot. They burn electricity so fast when they do use it, you loose that efficiency anyway. I found a lot of info on them, by sellers. I found a couple of ggod articles blowing the myths. All in all, gas or electric, it goes back to basic physics and is still takes 1 BTU to raise 1 pound of water, one degree F, at one atmosphere of pressure. Once the water is hot, it does not take much energy to keep it there. Here is an interesting article.

Good luck,
George

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George in Biloxi

06-02-2006 11:06:11




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 Re: Renni tankless water heaters in reply to George in Biloxi, 06-02-2006 11:05:17  
Link



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Richard G.

06-02-2006 07:39:56




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 Re: Renni tankless water heaters in reply to Bret4207, 06-02-2006 06:25:02  
Saw tankless water heaters in use in London over 35 years ago. Instant hot water and much cheaper to operate.



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