Need a drain unblocked, or have a problem with your drain? Nevertheless, besides the unit’s afue rating, there are other factors that can affect your boiler’s usage. Four oz beers of your choice! Contact us for technical advice, sales assistance or to simply give us some feedback. A proud four-time winner of the carrier president’s award! Good quality pellets with – mm diameter, - mm lenght and - mj.kg. My boiler broke this morning and was fixed by tea time! quick and efficient.