Recent content by WillJoiner

Ah yes of course, I was thinking about scale out the outside of the coil that might be insulating the coil, but of course that would have nothing to do with flow through the coil. Cheers!

Thanks much for all the replies - looks like possibilities could include scale on the coil/in the tank, the 3 port valve, and the pump. Easiest ways for a nonprofessional like myself to check these? For scale can I just draw down water out of the cylinder, pop out the immersion heater and take...

Unfortunately there's no balancing valve that I can identify.

Hello Recently moved into a 3bed and having some trouble with the HW, perhaps someone here has some advice. This is my first property with an open-vent system/cylinder/etc, it's been...interesting...to learn about. Vaillant 418 in heat-only mode (only the lower dial controls temp request)...