Modulating-condensing boilers are typically over 90% efficient! After a few years of use, this number can drop down to 65% or lower without maintenance. In order to keep your boiler running as efficiently as it did when it was new, you will need to flush the system at least once per year. Flushing the system is a relatively quick and painless job that will assure that you get the maximum energy output from what you have spent.
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