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Author:
mbrac (IN)
so here's my question - I put an on demand water heater in place of my tank water heater - but it still takes a long time for the hot water to reach the other end of the house - so I want to put a point of use device under the kitchen sink - so do I just plumb it in to the hot water line - and when the hot water from the main heater reaches the point of use device - it just makes it work that much less? thanks for the answer - it just seems like by activating 2 on demand devices at the same time - it will draw tons of AMPS!!!!!!
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Author:
packy (MA)
on demand heaters are activated by a cold water inlet flow sensor switch. as long as the hot water from heater 1 does not adversely affect the flow sensor in heater 2 then you are fine.
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Author:
mbrac (IN)
so your saying - it will just flow past the 2nd device if the water is already hot?
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Author:
hj (AZ)
No. but it may not turn on. However, the second "on demand" heater, unless it is very "large", will NOT produce much "hot water", unless the flow is severely restricted, thus negating any benefit. A small "storage tank" water heater is the better choice at the faucet.
Edited 1 times.
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Author:
packy (MA)
if connected to the cold water inlet, the water from the first heater can not flow past the second.
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Author:
hj (AZ)
if connected to the cold water inlet, the water from the first heater can not flow past the second.
What does THAT mean? If the hot water from the first goes into the cold water from the second, it will ALWAYS flow through the second.
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Author:
steve_g (CA)
There's an ongoing myth that water heated by a tankless water heater will get to the faucet any quicker than hot water from a tank water heater. There was even an article on the front page of the San Francisco Chronicle a few weeks ago making that same false statement (I emailed the author an explanation but never heard back).
The heated water still has to travel the same distance as it did before (unless you've relocated the heater) pushed along by the same water pressure.
The only way to reduce the time it takes for hot water to reach a faucet is to relocate the water heater or recirculate the hot water. Recirculation is a little trickier with a tankless water heater but it can be done. Depending on your layout, it's probable that recirculation is a better solution than adding another water heater.
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