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How to measure water pump pressure in a spa heating system?

Short version (TL;DR): how can I measure the output pressure of a water pump in a spa heating system and verify that it is within the gas heater input pressure specs? The Whole Story I'm trying to ...
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Can I reduce cold water inlet flow to combi boiler?

I have an ideal min c28 combi boiler. The problem is that with the shower fully on the temperature never gets hot enough for my wife, and, worse still, it can fluctuate between boiling and cold. I ...