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One good indicator is looking at the

One good indicator is looking at the boiler flame – which should be a healthy blue if it is yellow or orange then the boiler may not be getting enough gas, or conversely if it is getting too much gas, then this could be a more serious situation. Worked incredibly well and very quick and is easy to use. A system boiler, just like a regular (conventional) boiler, works on the principle of stored hot water.

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