just had a new wc90 wood/coal boiler installed 2nd new one i've bought different houses 1st one drive you out of house new house second boiler can barely get house to 73 deg. 1st house built in early 1900s two story with blown in ins.2nd home built 1985 with fiberglass lot of big windows.but smaller house. thought i might be having problem with the wood. just tried coal. stove grade little better still not great. any body got any suggestions? acts like its heating to much water. fan runs all the time trying to keep boiler at a 190 deg.