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Nuker-79 t1_iwwe91q wrote

Usually there is a panel on the boiler that opens up/pulls away and there will be two pipes joined together by means of a hose/pipe, this will usually have two valves or taps on it.

Remove power to the boiler first.

If you turn both these valves/taps to the open position, it will fill the water in the heating system. The system will have a pressure meter and will have a desired region, usually between 1&2 if I recall, usually also in green. Fill the system until the needle is in this region.

Once filled, turn off both valves and turn power back on.

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frzn_dad t1_iwxabyc wrote

I love how different this is depending on where you live. Have topped off a bunch of different boilers in the US never had to open a panel to find the fill valve. Always commercial boilers or single family homes in a high heating load area.

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