water heater

[peter the plumber]

hi i am installing a electric unvented water heater.i was just wondering will the pipe work need an expansion vessel or will the pipe work be sufficent.The hot pipe run is 15mm copper with a total length of pipe of about 8m thanks peter

 

[Lagerkhan]

hi i am installing a electric unvented water heater.i was just wondering will the pipe work need an expansion vessel or will the pipe work be sufficent.The hot pipe run is 15mm copper with a total length of pipe of about 8m thanks peter

No expansion vessel is needed but the ones i have fitted over the years have required a pressure-reducing valve and one or two have needed a blow off into a waste pipe ?....The instructions will tell you

 

[peter the plumber]

thanks for the reply waiting for heater to be delivered to site so will read mi thanks peter

 

[BoxBasher]

If its anything like over-sink heaters then:-

- Heaters with the control on the cold inlet expand through the outlet spout.

- Heaters with control on the outlet allow for expansion back into the cold feed (God knows how thats regs approved but it is...)

Think the second one would apply but I've only had to deal with over-sinks.

 

[Nige F]

It`s the length of the cold feeding it and the pressure therein that determines the need for a ex. vessel kit .........then the price doubles