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Charge pressure for sealed CH system
It occurred to me to wonder to what extent the recommended cold charge
pressure for a sealed system depends on the position of the pressure vessel and gauge. I have seen lots of suggestions saying that the easiest way to convert an existing vented system is to replace the F&E tank in the attic with a pressure vessel in the same position. However, many systems (particularly if using a system boiler) with have the pressure vessel and gauge quite close to floor level on the ground floor. In an average house, this represents a difference of about half a bar of static pressure between these two positions. If the gauge is in the attic, do you pressurise to half a bar less than if it were at ground level? Roger |
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