nominal power MW 1.4 nominal outflow temperature C 90 nominal return water temperature c 65 designed efficiency % 90 light oil kg/h 127 heavy oil kg/h 136 city gas Nm3/h 302 nature gas Nm3/h 151 boiler circulating water amount t/h 48 outflow water tube diameter mm DN100 feed water tube diameter mm DN100 blowdown tube diameter mm DN40 chimney diameter mm 350 length mm 3090 width mm 1590