Not once, but twice. And it still works.
Draining the heating header tank was the easy bit. Refilling it was a little fraught. You see, I didn't know the overflow was blocked.
Water streamed through the floor and the ceiling below that. And as luck would have it came through the ceiling just above a fairly nice flat screen TV. Cue wailing and gnashing of teeth. TV buggered.
Ah well, excuse for a new one then, eh? A few days later on our way out the door to Curries (to look not buy) I switched it on - one last chance as it were - . It worked. Smiles, jollification all round.
Two weeks later the new (reliable) Polish plumber drains the system , changes the Grunfos pump, and refills the heating system.
And the telly, and the handsets. SWMBO didn't even shout at me, or go silent, or any of the other things pissed off partners do.
Two days later, the telly is fine, and so's the handset. The TV is cleaner than it has been for a while now.