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I hope you fit a restrictor elbow or gas cock before you leave the job so it is up tocurrent standards so the next man in can isolate the appliance then!

the method used is correct it is good practice to do a tightness test before and after any work B ut if only one joint is broken then all is req is to purge at furthest point and use L D F. on the plug this is in the gas regs.

the red tank as you call it is a expansion vessel inside is a diaphram air on one side water on the other when htg is on the water xpands and pushes agaist the diaphram if it is not charged properley this cannot take place so the htg water press will go up untill it is blown out from the prv...

Has ur plumber removed and cleaned the plate to plate heat exchanger. these clog up with limescale in hard water areas.