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I recently had a new boiler installed. It replaced a 140,000 btu unit. the new unit is 87,000btu. I was told by 3 contractors of Burnham that the old unit was to big for the house. My house is about 1100 sq ft. The new unit works fine but some of my radiators are not getting hot. The thermostat is set at 72 deg. plenty warm enough to heat the house. All the pipes in my basement are hot but the heat does not seem to get to some radiators. Do you think the valves in these radiators are bad. They worked fine with the old unit. All 3 contractors took measurements of my house to determine the right size boiler