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On demand water heater. Does it burn out if the water is turned off?

On demand water heater. Does it burn out if the water is turned off?

Snow in the Eastern Cape
Blankets, scarves and steaming soup were the order of the day for South Africans caught unawares by chilly weather across the country on Thursday morning.
On demand water heater. Does it burn out if the water is turned off?

All electric house. I am considering adding on demand water heaters in two places. They cost at least twice as much as a tank type.

Does an on demand burn the heater elements if the water is turned off? My tank type does burn out the heater elements if the water level drops below the elements in the tank.

Also, is the on demand water heater repairable or would a person have to buy a new one in case of failure?

good question. if your turning off the water, best to turn off the hot water heater also.
all the point of use HW heaters I’ve worked on have a small quantity of water in them (4 oz) which stays 120 deg. as soon as there is a call for water, the cold water coming in triggers the stat to heat up the water.

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4 Responses to “On demand water heater. Does it burn out if the water is turned off?”

  1. mel Says:
    May 2nd, 2010 at 4:33 am

    good question. if your turning off the water, best to turn off the hot water heater also.
    all the point of use HW heaters I’ve worked on have a small quantity of water in them (4 oz) which stays 120 deg. as soon as there is a call for water, the cold water coming in triggers the stat to heat up the water.

  2. marvin A Says:
    May 2nd, 2010 at 4:33 am

    you want to buy a water heater that you know you can get parts for with relative ease.So you should shop around before you buy. I would go to a plumbers supply house rather than a HD or some other large chain for this item.
    Electric on-demand water heaters do not turn on until the water flows,,they do not even have a pilot light (like a gas water heater). If you shut off the water it will not harm the heater.
    An electric on demand heater will have an individual 240 volt circuit breaker FOR EACH HEATER. So you can always flip the breaker off and isolate the system.

  3. William B Says:
    May 2nd, 2010 at 4:33 am

    tankless heaters have a flow sensor in them they wont work if theres no water flow,
    never had to repair one so cant tell you on that,

  4. sensible_man Says:
    May 2nd, 2010 at 4:33 am

    Good luck repairing a tankless heater. Many Plumbers install them but do not perform any maintenance or repair. They are "state of the art" items and need someone who has been trained in repair.

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