I'm a very happy bunny! Damon contacted within minutes of my query and came the same day. He kept me accurately informed of an estimated arrival time.
He'd been cautious, in case the problem required a new part, but in the event, he fixed it. And stayed for a while, to ensure it wouldn't trip again.
5 hours later, the house is warm again, hot water's back on and I couldn't be more delighted with the service Damon and his assistant gave.
Very highly recommended.