can we assume that moving to one big system should be more efficient to run than for separate standalone ones?
One big system but with two or three small boilers linked together.
Don't assume that your current set up was correctly sized too.
Been talking about it a lot recently on here as it is my pet project for the summer, but we're doing an installation at the moment where the builder was convinced he wanted 40kW in the house (his own place). When the calcs were done, 15kW was the heat load at design temps. So this lot is in the process of being installed (ignore the wires - they're the Spark's). A boiler that can only do 24kW (although a few tweaks will get me 28 if I want it ). Even then, that is at his insistence - I wanted to put an 18kW unit in.
This is why I mentioned earlier, that you need to get the foundation information correct before tearing headlong in preconceived design ideas. This might well cost you a few hundred up front, but is likely to save you thousands in the future.
Remember also, that systems are sized for worst case scenario, which in the SOuth East only happens a couple of weeks a year. The rest of the time, the system is grossly over sized and therefore runs sub optimally.
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