The next step is simply to remove the drain cover; you could do this with a screwdriver if needs be if not, there may be a handle to grip in order to do the job still struggling? tie some rope around the handle and give it a good tug to see if it budges that way. Each boiler unit comes with an afue (annual fuel utilization efficiency) rating.
When booking your free quotation with mcs you can expect to have one of our trained installation engineers arrive promptly in order to guide you through what is involved in upgrading your system. The slant/fin monitron electric boiler is the smart choice as a heat source for virtually any hydronic heating system when another fuel is not available, or when a back-up for other heating equipment is desired although rated.