Combi Boiler inner pressure

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I use a combi boiler for heating and hot water. It seems that there is a small leak in the system, so I need to pressurize the system by opening and closing the valve on the “Filling loop” from time to time. This Filling loop is connected to the water main. In addition, a cold water supply pipe (a separate water pipe?) for water to the combi boiler is also connected to the pipe from the Filling loop to the combi boiler.

When I open the valve on the Filling loop, the pressure in the system increases. However, I do not understand why the pressure increases even though it is connected to the same water pipe (a separate system?).

Also, the cold water supply pipe is directly connected to the water pipe without a valve (it seems to be), but I do not understand why the internal pressure of the combi boiler does not rise to the water pressure of the water main.

If you know the answer, please let me know.

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    2024-05-20T09:10:35-04:00

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    Dear AskmeDIY

    I figured it out. The pipe that I thought was connected to the filling loop was actually a central heating circulation pipe. I apologize for any inconvenience.

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    It’s pretty simple. The domestic water supply is connected to a regulator. The maximum pressure you should have is about 19 lbs. And this valve should always stay open. Without pressure in the system, it just won’t work very well. Please feel free to post a picture or two of what you have.

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