keston c55

[buckley plumb]

got an on going issue with a keston c55 boiler it runs a swimming pool heater in a large house - the boiler is the highest point of the system - this boiler eats auto air vent on boiler at the rate of one every 6 months. the vent sticks open and leaks spoke to keston who said not much can be done is there a better make available its a standard 3/8" auto vent as far as I am aware is there a good quality one available

 

[plumber0808]

Maybe fit one of these?

SpiroTop: Automatic Air Vent

edit. Obviously not in place of boiler aav but on a high point on the system.

 

[buckley plumb]

Maybe fit one of these?

SpiroTop: Automatic Air Vent

edit. Obviously not in place of boiler aav but on a high point on the system.

never thought of that cheers . may not fit into boiler case - pipework comes into bottom of boiler in in 35mm reduced at last part to 28mm may benefit teeing into rtn with one

 

[plumber0808]

Yes just trying to think of a different option as all aav are pretty much the same. If you fit a spirotop it could vent some or most of the air before it gets to the boiler.

 

[Fishpond]

Agreed - Spirotech AAV are very good, but not cheap.

 

[Sparkgap]

never thought of that cheers . may not fit into boiler case - pipework comes into bottom of boiler in in 35mm reduced at last part to 28mm may benefit teeing into rtn with one

You still need a vent inside the boiler to get the air out of the heat exchanger/pump etc.
Use Spirotop most of the time, expensive but worth it for reliability.

 

[buckley plumb]

was hoping spirotech did a mini version that would fit where original is in boiler - I just don't fancy draining 4 floors of rads and underfloor heating

 

[plumber0808]

If the boiler is at the top, knock the pressure off and fit the spirotop. I'm guessing the filling loop is also at the top so knock the pressure off there

 

[buckley plumb]

going back next wk to fit standard auto keston vent for now and sizing up fitting a spirotec

 

[PriestyUK]

Keston Boilers are rubbish I cringe every time my boss sends me to install a keston or fix one, the casing is rubbish, the look and feel is crap, the location of the pcb is stupid, the boiler bracket is designed by a posh twit with no knowledge of hanging boilers (Got it off to a fine art now though, who-ff it up there with nuts in mouth and socket with extension bar in back pocket) That stupid AAV with tube that sits in casing and disintegrates over time, the flue is a good idea but with new regs regarding voids you would be stuffed. I really do hate this boiler grrrrrrrrhhhhhhh Keston!!!!!! Arh and the fact that they cant incorporate a simply automatic bypass.

Rant over

 

[plumber0808]

I don't know why any boiler has a built in bypass as they allow very little through to work properly if its a full trv'd system or is a microbore system you have to fit a external one, so end up with 2 bypass valves.

 

[PriestyUK]

2 bypass valves :S Microbore system, why would you want to fit one of them?

 

[plumber0808]

The new spec for zoning living and sleeping areas is covered in worcesters latest MIs if 2 zone valves are fitted you must fit a external bypass valve as well as having the one on the boiler.

If there not fitted they will throw it back at you

 

[PriestyUK]

I can understand that, I have had specs on commercial installations that like bypass valves after a pump and b4 a zone valve to protect the pump etc, but were talking about Keston boilers here not Worcester or zoning living and sleeping areas, or are we? :S

 

[plumber0808]

Rant over about bypass valves.