Airing cupboard contains the cylinder.
Directly
behind the cylinder in a roof space
Pump
Expansion
Vessel. There's a gauge. You can never have enough gauges. The pressure
relief valve leads to an overflow via a funnel.
Funnel. The effects of operating the pressure relief valve can be seen
immediately.
Flow
and return lead of to the solar panel. The el cheapo green insulation is
barely adequate. This long pipe run and inferior insulation is the
weak spot of the installation.Using Kirchhoff's 2nd Law used in Electronics. "The algebraic sum of the potential differences in any loop, including those associated with EMFs and those of resistive elements, must equal zero."
If the circuit "battery" (panel) is 10 "Volts" and the load (Cylinder) gets 8 "Volts", we drop 1Volt on each run of the pipe-work. We're loosing 20% warming up the attic. (This is worst case: A cold bright sunny May morning.) For volts read Centigrade.
Automatic
air vent. This is located near to the panel.
Having
a pressure gauge in a visible location is very useful! This is near the
filling loop - there is no circulating hot water: no pipe insulation is
needed.
Filling Loop. Regulations say the closed system cannot be permanently
connected.
Unconnected
state.