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Author Topic: Cooling with a Robur K18 ASHP  (Read 3235 times)
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« Reply #15 on: August 11, 2020, 10:32:05 AM »

30 Year old Potterton eh, would not be one the Netaheat or Profile ranges would it.
A lot of them had positive pressure combustion chamber design which made room sealing a safety issue. Positive pressure boilers were on our radar to do extensive case sealing checks on. A few Worcester 9.24s out their too with similar issues.
Get it replaced with a modern condensing boiler with load and compensating controls and and benefit from improved efficiency and better reliability. Win Win.

Are modern boilers considered reliable? I've had a few fail within the first few years with faults caused by horrible design choices. Eg a Main combi failed after 2 years and 2 months (2 months after the warrantee ended) because the valve that switched between hot water and heating leaked onto its own power supply causing a short. As the plumber was showing me the fault I couldn't help but think it was a terrible piece of design. The plumber reassured me that Main boilers are "better than most" but said that the standard wasn't particularly high.  

12x JA Solar 340Wp panels (total 4080Wp)
Lux Power inverter charger
5x PylonTech 2000 2.4kWh batteries (total 12kWh (11kWh usable))
Philip R
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South Cheshire

« Reply #16 on: August 11, 2020, 03:17:10 PM »

Slightly off topic from OP.

I have dealt with a similar failure of a same type of divertor valve fault in a Baxi Platinum combi. Wet the kitchen and trashed the actuator motor too.

The trouble with combi s is the divertor valve and plate heat exchanger. Your Main boiler is basically a budget baxi duotec/ platinum. Baxi just use a different warranty, price point and a cheaper aluminium main heat exchanger in the Main brand ( Quite a reasonable boiler).

Your plumber is probably right. The problem is that we all have our favourite brands of boiler. A lot of the big installers ( Those who advertise on the TV) like to fit market brand leader but won't mend them later.

Personally, I fit the Glow-worm, some people don't like them, but I think they are good all rounders. Great controls too. I fit ideals too sometimes ( same divertor valve as the Baxi) .

The best divertor valve (Inherently Leak proof) is that fitted in the Viessman and Worcester Bosch combi s (That is the only good bit of a WB imo.)

Seams that corrosion inhibitor additive can lead to premature divertor seal failure, but so does corrosion and sludge deposits too. Therefore must have a leek free system, good expansion vessel and non drip PRV along with a good magnetic system filter to keep to particulate levels down.Other things that dont help matters are very hot water and high system pressures.
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