Common sense is the word (or words, rather). First he didn't realise that firing up the boiler would back-feed to both pumps, f*rted around for a while fitting relays to isolate them, switched to MVs and still had a back circulation problem to the rads when the H/W was on. Eventually I pointed out that he'd now spent more than if he'd gone for a straight Y plan. I made an excuse, and left.
He's so rich now after 25 years in the city that he can afford to get the men in for jobs like this.
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