[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). 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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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.. 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.