Hello.
I notice several tankless water heater units being sold Ebay.
Some of the listings show these units fitted under sinks and connected directly to the hot side of a mixer tap.
I had been under the impression, that units such as these required an open vent on the outlet side of the heater
( as per a shower head ) to avoid overpressure due to heat expansion when shut off.
Could anyone please advise, if it is considered safe to use one of these units in this manner ?
If not, is there some form of safety valve or inline expansion device which could be used ?
It is my intention to use this unit for hand washing etc and not for boiling water.
Thank you, Pete.
I notice several tankless water heater units being sold Ebay.
Some of the listings show these units fitted under sinks and connected directly to the hot side of a mixer tap.
I had been under the impression, that units such as these required an open vent on the outlet side of the heater
( as per a shower head ) to avoid overpressure due to heat expansion when shut off.
Could anyone please advise, if it is considered safe to use one of these units in this manner ?
If not, is there some form of safety valve or inline expansion device which could be used ?
It is my intention to use this unit for hand washing etc and not for boiling water.
Thank you, Pete.