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Tool Talk Discussion Forum

Tankless water heaters

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GPWT

04-06-2005 09:54:05

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I am camp chairman for our hiking club and need to do some updating in our cabin. I am considering an electric tankless hot water heater since we don't have the room for a larger tank-type and we keep running out of hot water. I know that I will have to install a 30A or 50A, 240V feed to it, that's no problem. Does anyone have experience with these? Any good or bad brands?

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Bryan in Iowa

04-07-2005 13:31:08

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Re: Tankless water heaters in reply to GPWT, 04-06-2005 09:54:05

Dad's tankless heater finally got limed up after 24 yrs of use in his home.I took it apart ,,scrubbed up with some CLR . Took it upi to our cabin ..Unlimited HOT showers ! Propane fired , works great .

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Big Jim

04-07-2005 02:11:11

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Re: Tankless water heaters in reply to GPWT, 04-06-2005 09:54:05

Heating water with electricity is about the most expensive way to go. I have a gas-fired Taganaki tankless running my house. It will deliver over 4 gal a min which will run 2 lo flow showers at the same time. They make propane versions of the same heater. They are a bit pricey but come with a 20 year warranty. With my old tank-type, I could not fill the Jacuzzi to more than about 85 degrees before we ran out of hot water. It takes a litle longer now but 105 is no problem and you can still take a hot shower afterwards.

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dr.sportster

04-06-2005 19:19:01

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Re: Tankless water heaters in reply to GPWT, 04-06-2005 09:54:05

I was real interested in them until a guy told me his exploded.

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Rod (NH)

04-06-2005 18:34:41

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Re: Tankless water heaters in reply to GPWT, 04-06-2005 09:54:05

Hi,

Some numbers for thought:

A common formula for heating water on-demand:
500 x GPM x deltaT = BTUH = Heat required per hour
where:
GPM = gallons per minute
deltaT = temperature rise, deg F (40 to 140 is a common design standard)

Electric equivalent heat = BTUH = 3413 x KW
where KW = electric load in KW for on-demand water heating

Equating:
BTUH = 3413xKW = 500xGPMx100

Rearranging:
KW = 50,000xGPM/(3413) = 14.6xGPM, say 15xGPM

To get 1 GPM on-demand takes a 15 KW electric load.
Thats about 63 amps at 240 volts, pure resistance heating.

You can get more, lower temperature water at the same load by blending with colder water, if you wish.

Takes a hefty electric load to heat water on-demand.

Rod

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1945 A

04-07-2005 06:12:31

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Re: Tankless water heaters in reply to Rod (NH), 04-06-2005 18:34:41

Those sure are some "Gee Whiz" numbers and equations!
The small tankless heater I'm using (electric) is 120 V, will provide ALL the hotwater needed for a comfortable shower, and, judging from my electric bill, doesn't use anywhere near that much electricity.
Not saying you're wrong, I just don't think those numbers apply to every situation.....

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Kevin Bismark

04-06-2005 17:28:17

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Re: Tankless water heaters in reply to GPWT, 04-06-2005 09:54:05

I don"t know about the 30 or 50 amp feed at 240 volts, the last one I put in an office building had a 100 amp feed think we had one a year ago that was 60 but don"t remember, I have a propane fired tankless water heater that heats the workshop 30X65 with in floor heat, and it"s great, my uncle heats his shop that is larger with 2 electric tankless heaters on the utilities off peak program for 3 cents a KW hour

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1945 A

04-06-2005 13:33:43

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Re: Tankless water heaters in reply to GPWT, 04-06-2005 09:54:05

I constructed an outside shower out at my place (basically, located a fiberglass shower stall, and enclosed it), but bought a small tankless water heater, put a low flow shower head in it, and that little water heater does all I need it to do.
I paid less than $100 for it, and quite happy with it.

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Joe in Minnie

04-06-2005 12:52:09

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Re: Tankless water heaters in reply to GPWT, 04-06-2005 09:54:05

If you install an electric hot water heater on demand, your not going to like the Electric bill, why not consider a propane heater with a small softner unit, that's my 2 cents worth...

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rodgernbama

04-06-2005 11:54:48

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Re: Tankless water heaters in reply to GPWT, 04-06-2005 09:54:05

My cousin has an outside propane water heater. I don't know if they have an electric one.

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Weirsdale George

04-06-2005 11:18:33

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Re: Tankless water heaters in reply to GPWT, 04-06-2005 09:54:05

A friend has one in his fairly large home -- 60-amp breaker. Everything htat touches water is stainless steel. The family is quite happy with it. THe house was constructed three years ago. so I don't have any long term data.

I see where hard water could cause a problem with one of these units. As an alternative, have you thought about squirreling away a second, small water heater in the attic? Also, who says the water heater has to be inside the cabin -- just need a protective shelter for it.

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TomR

04-06-2005 10:37:32

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Re: Tankless water heaters in reply to GPWT, 04-06-2005 09:54:05

I looked into them when I built a new home last fall. I was advised against them because of the extremely hard water in my area. Apparently, they will "lime-up" and fail rather quickly if the water has a high mineral content.

I would also double check your water use requirements and water heater sizing. A water heater that pulls only 30 amps at 240 volts isn't going to heat a large quantity of water very hot.

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04-06-2005 10:05:22

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Re: Tankless water heaters in reply to GPWT, 04-06-2005 09:54:05

yes...installed a small SETS in the barn under the sink...excellent...real hot water on demand...never ran out...used it last summer but I'm happy. 8g wire...50 amp breaker.

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