I have a grant 50-90 oil boiler. The burner needed replacement. The heating engineer installed a Riello 40 burner even though on the quotation he said he would install a Riello 50 burner. The house is a standard 3 bedroom semi-detached house in Dublin, it has 8 radiators - 5 single radiators and 3 double radiators. I was wondering is the Riello 40 burner sufficient for the amount of radiators in the house?