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Single-stage vs. stepped gas valve on Burnham P206 hydronic boiler ?
Long story made very short: After a series of problems with maintaining a standing pilot, my HVAC repair contractor replaced the gas valve on my circa-1987 Burnham P206W hydronic boiler in March 2018. The original valve on the boiler was a 2-stage "stepped opening" valve (Essex model SX242NRT to be exact). After installing a series of Honeywell VR8300 A 4508 valves that all failed to hold a pilot (apparent manufacture defect with this batch of valves), he finally ended up completing the gas valve swap with a White-Rogers Model 36C03 Type 300, which is a conventional single-stage valve. When I gently challenged him on the replacement being single-stage vs. a stepped-open valve, he said they do this kind of swap "all the time" with no problems. With Spring weather on the way and the heating season nearly over, I let it go. Later, I contacted the Burnham factory resource, and they said they do not respond to homeowner questions and redirected me back to my repair contractor. With my repair contractor's position already clear, I am tee'ing up the question here for input...
The replacement single-stage 36C03 valve seems to be operating just fine. Do I need to consider paying for and getting this valve swapped out for a 2-stage valve in the long term ? Some documentation I have seen seems to imply the use of a stepped valve is mainly to limit burner noise. In my case, burner noise when firing the furnace with the single stage valve does not seem at all excessive.
This is a not-inexpensive proposition, likely $180 or more for just the new valve. Labor on top of that unless DIY (which I would prefer not to do on the gas side piping -- as a homeowner I replace thermocouples and do work on the water circulating side but prefer to leave the gas piping repairs and pressure adjustments to a pro).
Comments and input please. Thanks in advance !!