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Old 05-01-2012, 09:00 PM   #16
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Tankless Water Heater


alen did you look at link it tells you

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Old 05-01-2012, 09:06 PM   #17
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here is the link again and there is even a little video on right side of screen for you
http://www.gothotwater.com/
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Old 05-01-2012, 09:25 PM   #18
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Okay, I see what they are saying, but I still don't see how that gives instant hot water if you have to press a button to get the pump going.

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Old 05-01-2012, 09:49 PM   #19
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Okay, I see what they are saying, but I still don't see how that gives instant hot water if you have to press a button to get the pump going.

You are right, it doesn't. You still wait for it but without the water running....saves a bit of water, but still takes the same amount of time.
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Old 05-01-2012, 10:05 PM   #20
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You are right, it doesn't. You still wait for it but without the water running....saves a bit of water, but still takes the same amount of time.
That's what I thought, but it seemed like I was missing something.

Maybe I should re-word my initial statement.

You cant have a properly working recirculating system with a tankless water heater unless you include a storage tank.

I use the term "properly working" loosely, because maybe there are some people who like to push a button and wait for hot water.
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Old 05-01-2012, 10:09 PM   #21
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it is amazing to me the amount of people that confuse tankless as being the same as an instant hot
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Old 05-02-2012, 06:55 AM   #22
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AFter shipping and tax, the on demand system costs about $500 for the STS-70T

If you have to wait 10-15 seconds at the shower for hot water, that means cold water is running down the drain for 10-15 seconds. Thats roughly 0.5 gallons of water.

My water bill for 1800 cubic feet or 13500 gallons was about $70. That comes to 0.52 cents per gallon or 0.26 cents per half gallon.(a quarter of a cent)

SO it would take 500/0.26 = 1923..... thats 1923 showers until this unit paid for itself just in water savings.
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Old 05-02-2012, 09:07 AM   #23
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AFter shipping and tax, the on demand system costs about $500 for the STS-70T

If you have to wait 10-15 seconds at the shower for hot water, that means cold water is running down the drain for 10-15 seconds. Thats roughly 0.5 gallons of water.

My water bill for 1800 cubic feet or 13500 gallons was about $70. That comes to 0.52 cents per gallon or 0.26 cents per half gallon.(a quarter of a cent)

SO it would take 500/0.26 = 1923..... thats 1923 showers until this unit paid for itself just in water savings.
And still, it doesn't address the original issue of taking too long to get hot water.

The only way to achieve what needs to be done is to add a storage tank.
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Old 05-02-2012, 09:14 AM   #24
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And still, it doesn't address the original issue of taking too long to get hot water.

The only way to achieve what needs to be done is to add a storage tank.
Right...the only thing this on demand unit does is put the cold water at the hot tap back into the cold side of the system until the water running thru the unit reaches a certain temperature then it is diverted to the hot tap.
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Old 05-02-2012, 10:19 AM   #25
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The only way to achieve what needs to be done is to add a storage tank.
...or install a "true" point of use instant water heater.
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Old 05-02-2012, 11:20 AM   #26
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Your best bet is to add a small electric tank after the tankless unit. It sounds crazy, but makes a lot of sense. The tank will act as a buffer for the initial cold water from the tankless unit and also for the "cold water sandwich."

The storage losses on modern tanks are very low and the tank will be receiving hot water from the tankless unit. So, the tankless unit is doing almost all the heating. The tank just has to make up storage losses. It could also be used with a recirculating system.
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Old 05-02-2012, 12:43 PM   #27
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Your best bet is to add a small electric tank after the tankless unit. It sounds crazy, but makes a lot of sense. The tank will act as a buffer for the initial cold water from the tankless unit and also for the "cold water sandwich."
A 1/2 gallon of cold water down the drain at shower time costs about 1/4 of a cent based on my figures in post #22.

Poster has to ask himself, Am I trying to save money on wasted water or am I trying to save 10-15 seconds with my shower??
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Old 05-02-2012, 06:05 PM   #28
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hey thadsabb a.o.smith has a hybread that has both on demand with small water heater here is a link
http://www.hotwater.com/water-heater...xt-hybrid-gas/

and you guys still must not understand what the recurculating pump does for a on demand and if the you read the link and watched the video and still do not understand it i am not going to try here is another video for you

http://video.pbs.org/video/2195214406/

and the other thing the recurculater pump does is get rid of cold pockets and give you the instant hot water that most people think a tankless is
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Old 05-02-2012, 07:38 PM   #29
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Originally Posted by hammerlane View Post
A 1/2 gallon of cold water down the drain at shower time costs about 1/4 of a cent based on my figures in post #22.

Poster has to ask himself, Am I trying to save money on wasted water or am I trying to save 10-15 seconds with my shower??
The cost of the water is only what electricity the pump uses but running the water down the drain may have some effect on the septic tank and drain field.
The other issue is the cold water sandwich. To give those who have not used a tankless heater, if I run water for a shower and finish, turn the water off and dry then my wife comes in for a shower, she will turn on the water and initially the water will be pretty warm but since the burner in the heater has been off, there will be cold water entering the water heater and the burner has to get the heat exchanger hot before the water will get hot. This causes about 10 seconds of cold water to load up in the pipes so the shower will turn cold for awhile.
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Old 05-02-2012, 07:47 PM   #30
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I still have no idea why any residence would need or want a tankless water heater.

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