downrate oil boiler?
I have a 1 year old grant vortex boiler which can be set up with 15, 21 or 26kw nozzles. It currently has the 21, 3 bedroom 1.5 storey house with 11 rads, 200L invented cylinder.
Oil consumption over winter was around 11L/day which I'm a bit disappointed with as it's the same as the old non condensing combi it replaced used the winter before,.with a sticky valve for a month that meant the radiators heat up every time hot water was used.
I monitor the flow and return temps and I think that most of the time the boiler is short cycling on the boiler thermostat and I am wondering if this could impact efficiency. I have a tpi thermostat on 10 minute cycles but still get boler cycling in the on periods on a cold day.
So at the upcoming service I am thinking to switch to a 15kw nozzle with the hope that it will be enough, will short cycle less even if it takes a bit longer to get up to temp.
Does this make sense? Upstairs rads usually cut off with trvs pretty quick as heat goes up so thinking 15 might be ok even though 21 usually recommended for 11+ rads.
Thanks for any thoughts
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