Modern oil boilers

Have a look at Grant seasonal efficiency over 93% also do hybrid models

The Navien lcb700 might be what you are missing

An old post but I'll chuck my thoughts in. As above the Navien is capable of weather compensation or opentherm, a two stage boiler, with high, low function and dual temperature outlets.
Weather compensation is possible on other oil boilers. Probably the most common way would be with a buffer and electronic mixing valves governed by an outdoor sensor and pre set curves. Grant do a similar system using a mixing valve, although I'm not familiar with it.
Now, EOGB are soon releasing a fully modulating oil boiler called "The Sapphire" I don't think it's available yet but it won't be long.
Also another development soon to be available is HVO fuel (Hydrotreated Vegetable Oil). It has a higher calorific value than kerosene and claims of around 90% CO2 reduction, that is a massive step forward and I believe The Sapphire burner has been tested on this as well. With only minor adjustments to current oil systems this new fuel is going to be a game changer.
There is the option of a hybrid as mentioned above but they are quite large units and to some a bit of an eyesaw.

Just throw one of these in 😜

No experience on non domestic burners, that will change if I can get back to work though. What output on those two stage buddy?

SJB060685 said:

No experience on non domestic burners, that will change if I can get back to work though. What output on those two stage buddy?

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Boilers are rated to 350kw each, got the burners sat delivering around 300kw each. Now the heating off, one will do the job.

They’re around 50ish years old, no documentation but in essence, they’re simple and a joy to work on.

When I first got the call for them, they were getting sooted up and required a clean weekly. A proper service/commission later and I give them a clean before and after each heating season.

Cleaning the chimney was hard work, 35 meters....