The Heritage Uno and next 2 models up use a Sterling NuWay ST40 burner.
Heritage reccommends the use of a 0.3 USgallonperhour nozzle. Have used 0.4 but as suggested apparently soots up the unit.
Grande is ST50 i believe
100 watts @ 230V which is not the most efficient when cruising.
200 litres in 2 months we used if not more... heating and cooking on a 70 x 12 boat. should have got the Compact as UNO is definitely rubbish for us, tho compact has 2 burners instead of one for separate heating and cooking. i don't care if it heats while you cook if the oven maxes out and you can't cook on the hob or indeed heat the boat since the 2 systems are connected. Why not get a dedicated cooker and dedicated heating then when one of them breaks you can still eat or be warm? had to install a woodburner anyway. best thing ever!
wish i had full size gas cooker, alde boiler hooked up to engine too, and back boiler on woodburner as backup for heating bedrooms etc cos the UNO plays up all the time. dis diesel is rising all the time... 92p from Pace barge boat and 88p from uxbridge
don't rely on one form of heating get at least 2 and when it gets to -5 you can have them all on at once! - if they work that is.
I am very disgruntled as I just replaced the nozzle and had to work out why it didn't turn on... seems the ceramic spark plugs have to be aligned properly which i have done and feel proud of myself for doing this, BIG BUT just discovered fumes leaking out of the insulation at the top because of a failed gasket which I am going to replace. I have become quite the service technician!