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The shower in the upstairs bathroom takes its cold from the water tank in the loft. Why is this? Surely this will lower its pressure....Why not T off the mains water coming into the tank. Is there a reason to doing it this way round? Cheers

Yes, you're quite right. It tees off after the pump with the zone valve on the CH branch and then nothing on the HW branch (just straight to the cylinder and back)

Thanks for all the replies....how do I find out if it is a gravity system? It would appear that the CH is pumped and the HW is gravity fed but the pump must be pushing some water to the cylinder... Here is a link to a rough diagram.....Cheers...

We've just inherited a central heating system in a recently purchased house. The boiler is a Baxi Solo 18HE and appeared to be a fairly standard setup with 2 header and expansion tanks in the loft and a hot cylinder...... The timer and thermostat controls seem a bit old though (Randall 103e)...