I have an oil boiler / hot water baseboard (fin copper pipe; 5 zones including one for indirect hot water), with a 40-gallon SuperStor indirect hot water heater. I live in Massachusetts and use about 1000 gallons/year in a 2300 sq. foot house. After getting a handful of quotes, and after doing much reading here and elsewhere on the web, it seems that the best choice would be either System 2000 or a triple-pass cast iron boiler with outdoor reset. (People can feel free to correct me if I am wrong about this.) Accordingly, I am down to three choices:
- System 2000 EK-1 with Riello burner -- $ estimate -- all other parts removed and replaced;
- Buderus G115 (5-section) with Riello burner and Logamatic outdoor reset ($) -- Taco circulator pumps stay, but relays will be replaced with a Taco multi-zone relay with priority for hot water; and
- Pensotti Quatech DK2-5 with Riello burner and outdoor control ($) -- Taco circulator pumps stay, but relays will be replaced with a Taco multi-zone relay with priority for hot water.
Manual J heat loss calculation of about 80,000 BTU. Measuring by baseboard yields output of about 130,000 BTU.
I am inclined to go with System 2000 as I understand it will save me much more on fuel than either the Buderus or Pensotti set-ups would. Please let me know your recommendations.