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However, powerflushes go wrong and you may need to do work at the boiler to get it going again.
Lets be clear. Nobody is going to take you on. If the "big boys" see it as a revenue stream they will do it themselves. What big boys btw are not doing powerflushes? I do admire your get up and go. However, powerflushes go wrong and you may need to do work at the boiler to get it going again. (You sound like you are not GSR.) You will be by yourself and the big boys will not be covering the bill and you will be out on your ear if you do not resolve the problem. Good luck though. Try door to door sales. Speak directly with the decision maker.
We recommend City Plumbing Supplies, BES, and Plumbing Superstore for all plumbing supplies.