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Heating boiler gauges: this article describes the combination pressure & temperature gauge found on most hydronic (hot water) heating systems. The boiler gauge gives helpful temperature or pressure readings that tell us if the boiler is operating normally. The same pressure and temperature readings at a boiler can help diagnose problems such as.

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When the heating is turned on your boiler pressure should be between 1.5 and 2 bar. Most boilers will highlight this area on the pressure gauge in green to help you see if the needle is pointing to the correct amount of pressure. Some boilers will also have the critical zones below 1 and above 2.5 marked in red to help you identify any issues.

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AUTOMATIC AIR VENTS: More uncommon, but if too much air or gas is being generated in the central heating system, it will escape from the air vent and cause a pressure loss. This can be checked by temporarily tightening the cap (it looks like a bicycle tyre valve cap and can be either brass or plastic) and seeing if the pressure drop stops.

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Most pressure gauges display different-colored zones. If the needle sits much outside the green zone, particularly on the high side, you have a problem. Pressure Change Range. Pressure will change when the unit fires up the heat. In most cases, it should rise to about 20 psi while its heating element operates. That's optimal at normal.

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A boiler leak can cause low water pressure. A boiler leak can often be the culprit behind low boiler pressure. An issue with an internal component such as a cracked heat exchanger from limescal build up can also often be the cause of the leak. This leak could be the pressure valve or the pump seal itself.

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Sometimes a standard boiler can have a separate expansion vessel/tank fitted on the pipework that looks like a big red metal balloon. These would have a pressure gauge on the front and this gauge should be pressure of 1-1.5 bar. What pressure should a system boiler be? Much like combi boilers, system boilers have a built-in pressure gauge.

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Boiler pressure temperature gauge. Pressure temperature gauges (Figure 3) are for hot water boilers. For typical residential boilers, a pressure temperature gauge reads 0.8 bar (12 psi) when the boiler is cold and 2.1 bar (30 psi) when the boiler is hot. If the pressure in the system exceeds 2.1 bar, a pressure relief valve on the boiler opens.

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A boiler's pressure gauge will usually sit between 1 and 2 bars when it is turned on. The exact recommended pressure level will vary depending on the boiler manufacturer, but generally, anywhere between 1.0 and 2.0 bar is ideal. The boiler pressure level will rise when heating a home or providing hot water. However, it should still stay below.

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If the needle is below 1 (in the red zone), your boiler might have lost pressure. When the pressure is low, your central heating system won't be working efficiently. If the pressure is above 1-1.5 bar when the boiler's off, you need to bring it down to around 1.5 bar. You can do this by bleeding the radiators.

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Open both valves (or just one, if that's what your filling loop has) to allow cold mains water into the system. Listen out, you should hear it. Wait for the pressure gauge to reach 1 to 1.5 bar. Close both valves, one after the other (or just the single valve, if that's what you have) Switch the boiler back on. If needed, press the reset.

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The normal operating water pressure for your boiler and central heating system is between 1.0 and 2.0 bar. If the pressure drops below 1.0 bar, you need to repressurise it. If the pressure goes above 3.0 bar, you will see water coming from the pressure relief valve (usually on an outside wall).

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Turn both valves so that the levers are aligned with the direction of the braided hose. You should hear water running, and see the boiler pressure gauge going up. At about 1.2 bar, shut off both valves. Provided the pressure stays up, and there are no obvious signs of leaking water, it's safe to power the boiler back up.

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[1] Power Technology and Engineering (formerly Hydrotechnical Construction), Volume 43, Number 4, 247-250, DOI: 10.1007/s10749-010-0105-4 - Thermal Power Stations, Temperature regime for damaged steam superheater coils, V. A. Bogachev (this is a PDF file - if you can't find contact SpringerLeak)

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To reduce boiler pressure caused by too much water, you first need to check that this is the problem. You can do this by switching the boiler off and seeing what the pressure gauge says. If the pressure is higher than 1.5 bars, then the pressure is too high. It is easy to pressure release water from a boiler and fix this issue.

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A pressure gauge is usually located on the front of your boiler and should have a green and red section that can be used to detect when the pressure is too low, too high or just right. The force that it's calculating is that of the hot water that's running through the sealed system. Most boilers should run between one and 1.5 bar of pressure.