Every year, a Registered Gas Installer with Gas Safe should check all gas boilers for safety and efficiency. This is often not done because there are not enough of them. If the boiler is still under guarantee which could be up to 12 years, this check is part of the T&Cs. Our CO CO2 chart will show you how good or bad THE boiler is, the result could be do nothing, service, or time to replace. Every gas installer should have this chart.

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