Recent content by Sparkgap

As others have said, the system defo needs cleaning! From the sound of it the old pump might have sheared the shaft/spindle (have had a number of these pumps go that way) but if you've swapped them over you could try stripping it down and checking. Trouble with just checking the spindle through...

Modern storage heaters do have better control to retain heat until the evening. On-peak electric heating is more expensive: 1kW at 12p/kWh or whatever is still more expensive than off-peak even with the losses during the day, no matter how you dress it up. On peak electric heating is only good...

Circulating water through the tank introduces oxygen into the water = corrosion = leaks eventually. F&E tank lower than the cold water tank? Sometimes an overflowing tank is a sign of a leak in the coil of the cylinder. Is the F&E tank correctly sized for the heating system? If the system has...

My house is in a terrace of 6. The original water supply runs from a single stopcock in the road down the side passage then under the back kitchen extensions of the houses with the house stopcocks in the kitchens. If yours is similar you could be getting noise transmission from other houses...

Assuming it's a balanced flue boiler why not use a louvred door? All you are doing is preventing the buildup of heat in the cupboard. Alternatively mount the door on extended hinges so there is about an inch gap behind it top and bottom which would let out any heat.

Heating pump cavitation? what is the static head at the pump? Is the pump on too high a speed?

What's the system pressure? Excess pressure as the system heats up shutting down boiler? Could be failure of expansion vessel.

Without seeing a layout for the system could be several things: 1) lack of pressure/air lock (your plumber should have checked this first if he's any good) 2) pump shaft sheared: some makes of pump have ceramic innards which have been known to shear, pump looks like it's rotating but no...