Carrying on from a recent thread about the potential dangers of amateurs installing unvented undersink water heaters incorrectly….. Click on this

AncientMariner:
Then the next attending engineer after fixing the leak, asked if we were on a water meter? On the answer being yes, he asked where the expansion vessel was…… There wasn't one. Yet in the Installation manual it says that one is required.So why don't they fit one internally?
I take the point above about an expansion vessel in the heating circuit, but in this instance it presumably applies to the hot water side. I assume that water meters have some sort of one way valve?
AncientMariner:
Then the next attending engineer after fixing the leak, asked if we were on a water meter? On the answer being yes, he asked where the expansion vessel was…… There wasn't one. Yet in the Installation manual it says that one is required.So why don't they fit one internally?
I take the point above about an expansion vessel in the heating circuit, but in this instance it presumably applies to the hot water side. I assume that water meters have some sort of one way valve?
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