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As unvented are designed for about 18 ltr/min +.....wondering, what happens if installed on a system with much less flow....is it just that there's then no benefit over a conventional vented system or is there a performance downside??

I'm looking into a system which firstly gauges time required to reach heat and adjusts intial firing times for the boiler to acheive required room temp, and secondly does this while accounting for external temperatures. The aim is to maximise the efficiency of the boiler run times. I have...