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I've got a new twin coil cyclinder for a solar installation. In between the connections for the boiler, there's a female threaded boss into the tank. It looks about 18mm. What's it for? The boiler connections are in the middle of the tank which is 1800 tall. The solar connections are...

I'm planning an extension with a south facing pitched roof. Can anyone point me to a costs comparitor for different roof finishes? Concrete tiles will match existing. Copper (£!) will look fantastic PV solar would be enough to grid connect. OK, so I know that the last two will be more...

The loft insulation in our house is approx 150mm laid in between the 100mm ceiling joists. which are just a bit further apart than the width of the rolls that were used. So there's a small gap along each row. I want to increase the insulation, and to store stuff in the roof. So I'm concerned...

Will it make my system more efficient if I set the cylinder temp higher than usual (say 70) and use a TMV for HW distribution; then set the boiler so that it doesnt fire for HW until the cylinder drops to 40? The cylinder has 50mm insulation, and I've read somewhere(!) that modern boilers...

We've bought a typical early 70's 4 bed house. It has GFCH, open vent 'Y' system with microbore which is under the solid floor at ground level. None of this works. The hot water doesn't get hot. I've spent some time with replacement pumps and a flushing system. Basically the boiler circuit...