Fan convectors

We have replaced the lounge fan convector (admittedly 27 years old!) with a new one with half as much again nominal capacity. This (Myson) unit also has newer controls that are adapted to GSHP in that the cut-off for low water circulation temperature can be reset to a lower (32C) value. With various other changes this has raised the lounge temperature a bit, and stopped the convector blowing cold air when the GSHP goes off! FTR our fan convector is in a screw-closed box behind a decorative brass grille, and we leave off the official fan convector casing (just as with the old one) as this increases output significantly. The new unit also has a room temperature sensor (as opposed to a thermostat) which comes built-in but is quite easy to rewire to a remote location in the room (that is outside the wooden box!).

All the same we may still be limited as much by water circulation as fan nominal capacity, and I have raised the house circulating pump one notch (to middle of 3) which seems OK for now, though it is not very cold (-1 or so) at present so we shall see.

The Electricity Bill

Well it did come in and it does come to thousands! - but that is because it goes back to 2005; since it also credits us with payments since then we actually do not end up owing anything net - but the sheer complexity of the system (not to mention the length of the bill) is astonishing! Maybe it is not so bad to have it all itemized in one place - but why, exactly?!

Otherwise the sensor system now includes a switch on one of the GSHP-only phases (ie on if on & VV) so the average power it consumes can be monitored, on the assumption that it always draws the same if on (which seems true).