Engineer came and fitted new PCB with "altered HW parameters" which even he didnt understand, and throttled CW down into boiler.
Need to see how it's performing on Friday, as before it was running off pre-heat water then taking another minute to get HW to taps. Engineer said he thought boiler was struggling to keep up due to a slow/low fire.
I'm going to fit a combi save valve as the customer thinks its a good idea anyway, aye this will help the HW runoff.
Ideal rep is keen to help, and is determined for the customer to be happy, but I'm not sure how they would go about it. She asked for my opinion and I told her I didn't think the plate hex is big enough if it can't retain water long enough to heat it sufficiently. I'm sure a logic 35 would be better in the same situation, even though on paper, the specs are very similar.