This probably isn't a DIY job - but knowing how knowledgeable this group is,
I'm hoping someone can advise.
I'm involved with a local charity which rents out part of its buildings to
another organisation, and also re-charges them for their share of
electricity, based on "sub-meters" which we've had installed. That's the
We also re-charge for gas, which is used for CH & HW throughout the
building. Because the main boiler supplies the whole building, we split the
gas costs based on readings from three "heat flow meters" installed in the
various pipes coming from the boiler.
These "heat flow meters" have now failed (they're about 10 years old).
Repair costs are prohibitive, and replacements would cost well into 4
Does anyone have any suggestions (or a link) for a cheaper method of
measuring the proportion of boiler output used by each "consumer"? Absolute
precision is not necessary - an approximate split of heat consumption is
sufficient for us to share the gas bill fairly.