65 or 90 degree fire valve for Rhino Boiler?

[Plumpplumber]

I'm looking to fit an external fire valve to an older style 'Rhino' boiler (re-badged Firebird??) Bog standard cast iron, balance flue conventional boiler. I was wondering if a 65 deg fire valve might be prone to nuisance tripping on an older design like this and if so, might it be a better bet to go for a 90 deg jobbie. Any thoughts?

 

[Best]

Depends really on how well insulated the boiler shell is.
If you had plenty of time, you could put a thermometer inside the boiler house and take the temperature when the boiler has been running long enough.
Or if it looks highly likely to be too much heat, use the 90 degree firevalve.
Think regs ask for valve to be a metre or more away from boiler house, so you need right length of capillary.
Where you put the sensor is likely to make a difference.

 

[plumpblumber]

Depends really on how well insulated the boiler shell is.
If you had plenty of time, you could put a thermometer inside the boiler house and take the temperature when the boiler has been running long enough.
Or if it looks highly likely to be too much heat, use the 90 degree firevalve.
Think regs ask for valve to be a metre or more away from boiler house, so you need right length of capillary.
Where you put the sensor is likely to make a difference.

Yes, a thermometer would give a good indication but at this time of year the boiler is just firing for a very few minutes at a time so that might not give a true picture of how hot it might get in mid winter going full whack for longer periods.

I dropped an email to Firebird to see if they had a recommendation and their technical dept reckoned it would always be best to fit the 90 degree valve so I think I'll go with that.

Many thanks for your thoughts.

 

[Dotty]

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[Plumpplumber]

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