@flameport - well I'm grateful to you and everyone else who has put a view forward - it's been really, really helpful. I'm sure I can't be the only person who has to think through these issues. Maybe some of the wider points raised will help others, too.
If it's a total fail with the Dafi, I'll come back and tell you. But at the moment, the capital (installation) cost and running costs appear very favourable compared with all the other options, even if we end up putting three 11kW Dafi heaters in.
If it's a total fail with the Dafi, I'll come back and tell you. But at the moment, the capital (installation) cost and running costs appear very favourable compared with all the other options, even if we end up putting three 11kW Dafi heaters in.