You want the difference in temperature between the water coming into the collector and what's flowing out to be 20F or less (eg: 68F pool water, 88F...
Big old cast iron radiators are GREAT for gas-fired modulating condensing boilers- FAR better than fin-tube base board for two reasons: They put out...
Most insurance carriers won't void anything as long as the local inspectors signed off on the retrofit conversion burner installation. If the boiler...