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Cheers, appreciate the help.

All the breakers are 16A, and it looks like all the wiring is 2.5mm T/E, one cable to each heater. The heaters I am replacing were drawing 1.2KW, but I'm changing them for 2 element heaters, so they will be 1.7KW each. Can't see a problem with this.

I wasn't really thinking about the total load, but that's a really good point. I've done a few calculations and if I just replace the 2 heaters I'll be drawing 6.2KW in total for heating, 27A, and the main fuse is 100A so I guess that will be OK. There's not a huge amount of additional load...

Ah, so keeping full rated elements would give the heaters twice the effective heat capacity in the right circumstances. Might be worth changing the elements then, get more charge in the heaters during the day.

They are (apparently) half rated, they look like normal elements but I remember having to take the original elements back to the supplier and they gave me the half rated ones in exchange. Never really understood why they were necessary though.

I have to replace a couple of storage heaters in my house. I get a 14 hour cheap rate tariff (called Option 14, unsurprisingly), so I get 14 hours of cheap rate electricity every day :). The old heaters were designed for economy 7 (7 hours of cheap rate power daily) so they were fitted with half...

From the reviews it looks like it's worth trying so I'll get one and fit it this weekend. Thanks!

It's difficult to predict when it will happen, so I guess I'll try a replacement valve and see if that fixes it. Thanks.

I sometimes get an unbelievably loud grinding / banging noise from the pipes in my loft - it seems to originate at the cold water tank. It sounds like a really loud hammer drill, but you can actually feel it through your feet! It lasts for between a few seconds to about half a minute, and I'm...