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Posted by HeatPro on April 13, 2008 at 13:21:20:
In Reply to: modulating burner posted by Juan Piper on April 13, 2008 at 13:06:03:
Steam systems were invented before the on-off of gas and oil fuels. Provided the input at low fire is sufficient to continue to charge the entire system with steam, a long steaming time is more what the inventors of the steam systems had in mind with solid fuel.
Getting a close-range-acting new thermostat can cause problems with your intent to have a long cycle with the new gas valve and pressures. Room drafts can cause the burner to stop firing, then go on again against your intent.