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gas conversion, tankless coil not performing
I had my Weil-McLain Gold boiler converted from oil to gas last month using a Carlin EZ-Gas burner. It's running the steam heat nicely, but I've noted that the performance of the tankless coil for hot water has changed. A shower cools down noticeably after about 5 minutes, stays cool for a couple of minutes (not cold, but the shower is turned up all the way and I'd like it a bit hotter), and then warms back up. There were subtle temp swings before with the oil burner, but it never cooled enough to max out the shower valve. Any thoughts on why the operation of the coil has changed, and how to get it back to working like before? I wonder if the gas burner takes longer to come on when called and this allows the coil temps to drop.