Potterton Kingfisher 2 convert to sealed system?

[DaleRCL]

Hi guys,

Can anyone tell me if it is possible to do convert an open vented system currently fitted with a Potterton Kingfisher 2?

If so, I know how to do it, and the risks involved. I just wanted to know if it's feasible as I know that there are certain parameters on sealing systems with older boilers regarding issues with pump overrun.

Any input would be greatly appreciated.

Thanks

 

[sooey]

It can be done but you need the potterton overheat thermostat kit.

 

[45yearsagasman]

There is mention of operating that boiler on a sealed system in the installation instructions. It is not only a bypass that should be considered, it's overheat protection that is required, and the effect pressurising an old girl like that will have on the heat exchange gaskets.
Your call.

 

[Agile]

There was someone on a forum a few years ago who did that and a pipe burst and caused about £3500 of damage.

No one else would accept responsibility although there was no question that he had fitted the kit exactly as instructed.

The problem was caused by plastic pipes above the ceiling bursting when overheated.

Most would say avoid it as the boiler is pretty old and inefficient and a replacement would be a more sensible option.

But if it must be done then it would be sensible to ensure there is no plastic pipe.

Tony

 

[DaleRCL]

Thanks guys. I couldn't agree more that it's risky business and a new boiler would be way more efficient. However there is a major issue with fitting a new boiler as an acceptable flue termination is almost impossible. Client has asked me to advise. My advice will be either try everything to get new flue termination agreed with building manager or opt for Electric boiler.