How do I add pressure to my heating system?

Locate the filling loop, often found on the underside of your boiler. Open both valves to allow water into your heating system. Keep an eye on the pressure gauge and close the valves when the pressure reaches 1.5 bar. Switch on your boiler and reset the fault code (if necessary).

Can you bleed radiators when the heating is on?

You can’t bleed a radiator when the heating is on, as it may be too hot to touch. You could also get hot water spraying out of the radiator. Use your radiator key to turn the valve at the top of the radiator. Bleeding your radiators can cause the pressure to drop.

How does a pressurised central heating system work?

A pressurised type of central heating system operates in a similar fashion to a combi boiler. Mains water is heated directly, rather than in a hot water tank, which means a reduction in wastage while saving space over conventional systems.

What to do if your central heating system is losing pressure?

Sealing a plastic bag over the end of the pipe lets you check for water over a longer period.

How can I find out if my central heating system is leaking?

Please note it may not work on all types of leaks as is only a solution for slow leaks. A good way to find if you have a leaking central heating system is to acknowledge the water pressure keeps going down on the central heating system after so long.

Why are central heating systems unsuitable for two bathrooms?

The main one is that their flow rates can be quite low as the water has to be heated as it travels through the boiler i.e. there is no stored hot water to fall back on. This means they are unsuitable for homes with two or more bathrooms as the simultaneous use of two outlets will decrease the flow rate even further.

Where is the pressurization valve on a heating system?

These components should all be located on the inlet side of the circulating pump (see Figure 2). For heating systems, the static pressure will increase as the system is heated and the fluid expands. This is normal, and as long as this increase in pressure is kept within the limit of the relief valve, it will not have any impact on performance.

Sealing a plastic bag over the end of the pipe lets you check for water over a longer period.

How to diagnose problems with a hot water heating system?

To help that, a pressure reducing valve lessens the amount of water pressure from the city to the boiler. The pressure reducing valve can be tested and a pressure gauge on the boiler will also indicate system pressure. 4. An expansion tank to reduces the stress on the system. The top portion is filled with water and the bottom air under pressure.

What should boiler pressure be with radiators turned off?

The black pointer shows the actual system pressure. With the heating system cold, the pressure should be between 1 and 1½ bar With the heating system turned off, the only pressure in the boiler and radiators was the pressure from the the weight of water above that point (the static pressure).