Discuss HRM Wallstar Oil Boiler - Advice please in the Plumbing Jobs | The Job-board area at PlumbersForums.net
I presume the Firebird has a mixer to reduce the temp to ~ 65c and then the shower or whatever will reduce it to 50C but it doesn't matter as the stated conditions are water from a stored temp of 78 to water at 50C (from 10C) so the ratio is 1.7:1.
Thinking back again to the burner re firing at a store temp of 73C, if the probe picks this up very early in the draw off then you could be adding in energy early on so that will have the effect of increasing the thermal store so the 120 litres may actually be not too far off the mark as it would only need a additional ~ 2.5 kwh to achieve this but needs a bit more thought.
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