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I know or - the commissioning certificate shows cleaner was put into system but he never came back to flush it out. Perhaps there's sludge so will ask engineer next week to check!

What's fouling?

Unfortunately it isn't the Plus model - there's no additionally ports on the side of cylinder as ACV website pics show. There's one unused port on the top of the cylinder but no idea what it is for!

Johntheo5 - I'm grateful for your time and calculations that I wouldn't have had a clue how to figure out!

Re fuel consumption - that's actually good news because I do think my main worry was short cycling drinking the fuel but only a potential 3-4% efficiency reassures me that the home heating oil isn't being used in excessive quantities. The plumes of condensing steam being emitted every few...

Is it a fair assumption that with or without a 25L buffer the percentage of time the boiler is firing during each cycle time for whatever heating demand remains the same? The only way to reduce fuel consumption is downsizing nozzle?

That's it - a two pipe buffer is less hassle I think but no disadvantage to a 4 pipe system

I've looked at buffer tanks and a lot of advice for a 25L or 50L is to run a two pipe system and by doing that no extra pumps are needed. A T pipe connecting buffer to flow and a T pipe connecting return to Buffer Tank.

The nozzle on the Warmflow could have been reduced to 1.35 but not certain.

Johntheo5 I think you have hit the nail on the head! I do recall now the Warmflow was jetted down probably to 44kw but the Warmflows bigger buffering effect with 50L rather than 21L in the Grant meant I wasn't concerned about short cycling as your calculations for the Warmflow burner are spot...

The dhw (flow and return) are lagged and as the garage is 4ft below house level likely to be buried under 6ft of blindings/soil. The garage is about 7 metres from house and including internal run there could be about 30 metres of pipework. The ufh and radiators are plastic pipes from garage to...

The hw is on a circuit loop from garage boiler to house and back constantly circulating from 6.00am to 10.30pm. The hw in summer is on 7.00am to 10.30pm but is supplemented by 2.5kw of solar heating thou only if it's a nice day! My next try is to turn dhw thermostat up to beyond boiler...

Downsizing initially to 36kw. We run HW early on in morning then radiators as well for 30 mins. The ufh comes on for 4 hours later and runs with hot water but never with radiators! I believe we can go down to 26kw without changing burner - just need an air adjustment disc from Grant which I have...

Spoke with heating engineer who installed boiler and will call next week to downsize nozzle. He seemed to be of the opinion that 1 min on/1 min off was typical and acceptable for ufh and a buffer wouldn't work! I'll ask him his opinion on reducing burner down to a Riello 15/26 which is a...

Cylinder is a Smartline E300 thou seems bigger.

Unvented hw cylinder with expansion vessel and is 200L capacity. Our hw usage isn't high - it's the circulating pump on hot water system that's needed as it's takes 3 minutes to get hot water if pump is off. No water meter installed.

I've been looking all over the pipework but cannot see an abv! The blue valve at top of 200L hw cylinder just seems to be hot water circuit but no direct connection between flow and return! Still to do timings for hw.

Johntheo5 - it's a very interesting spreadsheet (Im keen on spreadsheets) and supports the advice from snb1 regarding downsizing nozzles sizes. It's good to have calculations that show a buffer tank shows little or no reduction in average burner run irregardless of nozzle size therefore of no...

Okey doke - not at home atm but later

Hi Snb1. Thank you for your very helpful thread. The installing engineer is indeed OFTEC registered. Grant have already confirmed a smaller nozzle can be installed and if there is little or no difference to the short cycling to get back in touch with them and they will advise on next steps. I...