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Combi boiler (Worcester Bosch Greenstar 30 Si mk.4) system pressure gauge always reads 0 psi. Central heating and hot water seem to work just fine. Why is the gauge always 0, and
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ACR Plumbing & Heating - A Worcester Bosch Combi Gas Boilers is both an efficient water heaters & a central heating boiler in a single compact unit. Cost-effective & 97% energy-efficient, they
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