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When fitting a positive head pump, the recommendation is that the pump should be fitted at least 600mm below the bottom of the tank. Fair enough specifying a minimum pressure but why from the bottom of the tank? - the pressure seen by the pump is from the top of the water. So does the spec...

Excellent. In 15 years the only time the immersion heater has ever been used is when the central heating has been down for maintenance. Adding the shower pump to the immersion heater circuit it is then.

My daughter has grown up and left us so the world won't end.

A mere technical matter of little concern. Wading through the bureaucratic swamp is much, much harder. I can't imagine what sort of fault the CH would have to develop to take down the whole circuit.

I did notice that. On a 5A circuit that could already be supplying 2A? In theory, two 3kW heaters could be plugged into a radial double socket... So long as it is only theory and the rules don't actively outlaw connecting small loads to the immersion circuit it must surely be the preferred...

Worth a try. My preference but wondered because it already has the central heating on it (through an FCU with 3A fuse). The circuit is 2.5mm with 15A in the CU and my understanding is that a radial may only provide 2 outlets. I know a second FCU would be perfectly OK from an electrical pov but...

It's a motor with two impellers, for goodness sake. They should either manufacture it properly or take it on the chin, not try and escape with wriggle out clauses.

OK. It would seem a bit silly if the regs demanded qualifications to crawl around the attic and drill holes in walls.

To return to this subject, we have established that the airing cupboard is not part of the bathroom, hence a spur is not (normally) notifiable. However, the cable running under the airing cupboard floor doesn't have enough slack for one junction box. It therefore requires two JBs with a short...

Eh? I just before I had a new CU fitted I laid the cables and sockets for a new ring. The electrician then tested the circuit and wired it into the new CU. Surely that isn't what you mean?

Gotcha

Thanks for this. But I can't see the reason behind the "anti-gravity" loop. It's a bit of a sci-fi term; I'm sure a more meaningful name could be devised.

I posted on the electrics side about fitting a shower pump on the airing cupboard ceiling. The pump will have at least 2 foot of positive head (and no pipe work will extend up into a negative region) so I don't believe a negative head pump is necessary. But additional air vents, anti-gravity...

Looks like another thread.

Fortunately the airing cupboard is only accessible from the landing. It doesn't.

I want to put the pump at ceiling height so would need to spur the fuse outlet. Further information. The house was built in 1973 so has red/black wiring. The JB to fuse connection would therefore be blue/brown. Apart from putting a notice on the fuse box, is this a notifiable change? I...

I want to install a shower pump in the airing cupboard. A 3A switched/fused outlet is provided for the central heating. I had hoped this was on a ring but discover it is taken off the 20A immersion heater supply. The downstairs ring cable runs under the airing cupboard floor. Two...

The house was built in the 70's. They did weird things then.

Yes they are 2 inches wide and are spacers, not weight bearing. I don't know the original reasoning but my thought is that it allows the pb edges to be joined accurately without having to meet at the joists. In other words, new board would similarly be mechanically attached to the joists but the...