I was initially researching the installation of a condensing Combi unit (Lockinvar Noble) to provide DHW and heat for my radiant flooring, but after talking to a couple of local HVAC techs they advised against it. There concern was with my Nat gas supply, my gas is Raw Natural Gas from oil wells on the property. They are not sure if the Raw Nat Gas will cause problems with all of the sensors and valves used in the modulating systems in the new combi units so they recommended installing an old style non-modulating cast iron boiler.
This is a new relatively tight house without a chimney so I have been looking for boilers with power vent and exterior makeup supply (preferably sealed combustion) but am not finding many options available.
- Does anyone have experience with Raw Natural gas use in modern modulating boilers?
- Can anyone recommend a reliable boiler meeting my requirements?
- Two boilers that have been mentioned are the Dunkirk XEB Series 2 and the U.S. Boiler ESC, can anyone provide comments on either of these boilers?
Any comments or recommendations are appreciated.
Thanks, David
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