What causes boiler pressure to rise?

When you turn the heating on the water in the pipes and radiators heats up and expands. This water expansion causes the pressure to increase in the whole system. So, when the heating is on you should notice the boiler pressure on the gauge to increase slightly but not above 2 bar.

How do I reduce the pressure on my Powermax boiler?

You have to manually reduce the pressure to zero – preferably off a drain off valve or radiator tail. There should be a red vessel – when you pump it up you need to ensure the system pressure doesn’t does rise ie keep draining down to keep the system pressure at zero.

How do I turn the pressure down on my boiler?

How to reduce your boiler pressure

Switch off your boiler and wait for the heating system to cool.
Identify and check the boiler pressure gauge.
If it’s above 2 bars, you’ll need to reduce the pressure.
Ensure the filling loop or relief valve is tightly closed.

How does a PowerMax 155 water store work?

I think the 155 was the first PowerMax to be launched. The unit is a ‘thermal store’, heated by combustion gases from a pre-mix gas/air burner at the top which pass downwards through eight tubes, or ducts, in the centre of the water store, to be collected at the base of the unit then exhausted to outside.

Is the PowerMax 140 the same as the 155X?

The 140 and 155x are similar to the 155, and are built is the the same format with a sump/flue collector at the bottom containing a gauze which is very prone to blocking and virtually impossible to remove for cleaning and replace correctly/safely.

How big are the ducts on a PowerMax boiler?

The ducts are about 30mm in diameter and each contains a twisted stainless steel ‘turbulator’ to slow the passage of flue gas and increase thermal efficiency. These turbulators have a habit of overheating, partially melting and blocking the passage of flue gas through the unit, and are fiendishly awkward (read ‘expensive’) to remove and replace.

What to do if your PowerMax boiler is broken?

PowerMax boilers…. If your Powermax is either broken down or not working properly, most faults can still be fixed. Call or text me on 07866 766364. I am Potterton-trained to work on the Powermax and carry plenty of spares in stock so most faults can be fixed in a single visit.

How did the PowerMax high pressure shower boiler work?

An integrated device that was capable of delivering both central heating and mains high-pressure hot water. This was using the ‘thermal store’ principle, so high-pressure showers could be fitted in flats especially without the use of those expensive and noisy pumps. So how did the Powermax boiler work?

Why are there two pumps on a PowerMax 155?

Oddly, the 155 has two pumps. One operates the central heating circuit, the other is described in the instruction book as a “heat Ex. Pump”. The only purpose for this I can imagine is to agitate/circulate water within the thermal store to ensure uniform store temperature and prevent stratification.

Is the PowerMax boiler allowed under building regulations?

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.

Which is the most efficient version of the PowerMax boiler?

Potterton has 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.