Back boiler open vented converted to sealed

[Christopher buzzard]

Evening all. Asked by customer to look at new unvented installation he recently had done by others. Number off issues picked up on the install but the my main concern was the fact they converted the back boiler from open vented to a sealed system. Expansion vessel is way undersized. Am I right in thinking this conversion can't be done as the back boiler doesn't have an overheat stat if the thermostat fails.

Regards

 

[ShaunCorbs]

Yep backboiler can’t be converted/ it’s not designed for pressure

 

[Christopher buzzard]

@ShaunCorbs thanks. I will have to give him the option to put the f&e tank back or fit new boiler.

 

[ShaunCorbs]

New boiler wouldn’t put it back

 

[Harvest Fields]

I would also fit new.

 

[heliotrope]

Certainly should get vessel size sorted as could be constantly be
discharging if under sized.

Many back boilers can be upgraded from open vent to sealed system,
and some can run sealed without modification.

You should consult the manufactures instructions or contact the manufactures direct for confirmation. It may be that the necessary upgrade has been carried out (if required).

Boiler should be not be used if not permitted to be used sealed as could be dangerous.