"Back" Boiler - Radiator bleeding every 2 weeks

[chewymix]

Hi

In my victorian semi i have a gas fire with what i know as a 'back' boiler, i dont know what its technically called but we dont use the fire at all just the radiators.

In a couple of years we'll be doing a large kitchen extension and so will change the boiler at this time, however i have been having to bleed 1 upstairs radiator every couple of weeks as it keeps getting a cold spot.

If i keep getting this air in the system does that indicate a leak, even though there is no evidence of such? Also even though this system is clearly very old it works perfectly, apart from the air issue, and so should i work towards if it aint broke then dont fix it, at least until we do the extension work?

Any thoughts?

 

[twgas]

rads constantly in need of bleeding may be caused by a leak but there are other possibilities, too high a pump setting, poor installation, gassing, toname a few

 

[chewymix]

thanks for the reply - whats gassing ?

Thinking about it the bleeding seems to have started since turning the thermostat up a bit for the winter - does that signify anything?

 

[andytheplumber]

Best to wait untill the new extension. dont put down new floors untill you get the boiler fitted especialy lamminate

 

[twgas]

gassing is production of hydrogen gas as a result of corrosion. usually no inhibitor if system is old

 

[chewymix]

thanks - think i will wait for the extension if i can!

Having this 'back' boiler is there any way to replace it and reuse existing feed pipes to the downstairs rads (4)? I ask this as about 2 years ago we had solid oak floors laid throughout downstairs hall, diner and lounge and i would be saddened to have to hack the floor!

Hindsight is a wonderful thing.....

 

[twgas]

rad circuit should be reusable

 

[chewymix]

even if boiler is relocated from diner to new kitchen? If so then thats a result!