I bought a used EBW-300 , then had Econoburn essentially rebuild it to like new condition. They replaced the whole back of the boiler , completely new heat exchanger, then went over the entire boiler. The previous owner had the boiler plumbed to 2”( the min pipe size), when I got the boiler there was no loop pump . What I would like to know is, what is the make and model of the pump that comes from the factory? Also what size pipe are you owners using for your loop and piping to and from your storage? Mark