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Question can a Therma-Flow coil (625-5, resident in a Weil McClean boiler) be back flushed? Although I know I am on borrowed time with the boiler, I would like to mitigate the lack of hot water pressure and consistent temp. The unit is 23 yo, but I cannot afford to change it out yet...and, besides the coil, the unit is in good shape. I swapped out the mixing valve, which increased water temp by about 20 dg...but coil is definitely blocked...and yes, we are on well water. The $600 or so that it would cost to have someone come out and change it doesn't make sense, if I swap boiler out in the spring...thoughts?