Gas Boiler Upgrade

The client had a gas fired boiler (and this was originally a oil boiler with a gas conversion kit). The boiler was twice as large as a heat loss (Manual J) required it be, and was operating at around 72% efficiency. It was located in a garage with jacket losses to unused space (the losses from the boiler added no heat to the living space) adjacent to the domestic gas hot water heater (over 10 years old - usually when they start to fail signaled by the debris clogging the drain cock). 

The solution was to replace this boiler and gas hot water heater with a condensing 95% efficient low mass boiler with an indirect hot water tank and thermostatic mixing valve. The boiler works off an outdoor reset control which allows low water temperatures to heat the house on cool days that require heating (45 - 60 F). The boiler was also right sized for the house at 80,000 BTU's. The boiler step fires on load, so if the house only needs 20,000 BTU's, it can produce just that amount of heat - saving energy. This system qualifies for the $1500 energy tax credit.