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The Potterton Powermax boiler for some reason seems to frighten the gas safe engineers away, as soon as the name
Powermax is mentioned no one wants to know, But why?
The boiler was based on an excellent concept it’s a shame the implementation was so flawed.
The idea for the Powermax boiler was conceived back in the days when mains
pressure hot water cylinders otherwise known as unvented hot water cylinders, were not permitted under the Building Regulations.
The only way to get high performance showers was by installing pumps.
The Powermax boiler idea was to combine a boiler and hot water cylinder into one unit an integrated device that was capable of delivering both central
heating and mains high pressure hot water, by using the ‘thermal store’ principle,
so high pressure showers could be fitted in flats especially without the use of those expensive and noisy pumps.
A tank full of water was heated not by a separate gas boiler, but by an integrated gas burner that squirts flames
down a number of tubes running straight through the water tank.
The tubes heated the thermal stored water, which was then pumped or circulated around the radiators for central heating side;
the best part was the way the mains pressure hot water was produced.
Cold mains water was fed into a coil of tube suspended inside the heated water tank, and the cold water was heated through the wall of the coiled pipe in real time as it
flowed through the coil on it’s way to your hot tap or the shower. Mains pressure hot water at high flow rates with no pump, in full compliance with the Building Regulations of the day! Great.
The boilers were so efficient that when they had long flues fitted they would start to condense,
and with the flues being made from aluminium, they would start to corrode and release Carbon monoxide.
Another problem is the gas valve and burner gasket.
The clever new type of gas valve does not take kindly to being fiddled with by service
engineers without the use of a flue gas analyzer to measure the effect of the adjustments being made.
This problem perversely combines with the fact that the main burner gasket is prone to leakage.
Always make sure that a new gasket is always used every time the burner is removed for servicing, this is the advise from Potterton technical support.
Not many service engineers carry these burner gaskets in their van.
The engineers who see no point in replacing the burner gasket are possibly the same engineers who do not have use of a flue gas analyzer.
This has lead to CO from poor combustion leaking from the burner gasket and has apparently lead to the deaths of a number of users of Range Powermax boilers in the past.
This is one reason for the bad reputation of the Powermax boiler and the reluctance of service engineers to work on them.
If you come across a Powermax boiler on your travels, don’t be put off by them; you can download all the installation and serving instruction from the Internet.
Just type into Google, Powermax boiler and the model number, and you will find all the information you need.
Potterton have since updated the Powermax boiler, today’s version is the HE model, HE being the Highly Efficient condensing version.
The new version on the Powermax boiler is basically a boiler and cylinder joined together as one.
High pressure hot water and pressurized central heating system. In general the Powermax boiler is not as bad as people think.
Parts can be very expensive should you need them, but then that’s normal for something that’s different.
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