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

By: mel

mel — Fri, 23 Apr 2010 03:32:01 +0000

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.

By: sensible_man

sensible_man — Fri, 23 Apr 2010 03:09:40 +0000

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.

By: William B

William B — Fri, 23 Apr 2010 02:44:13 +0000

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,

By: marvin A

marvin A — Fri, 23 Apr 2010 02:38:40 +0000

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.