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Permalink Reply by Mike Sabol on February 8, 2013 at 9:36pm

There are two valves that control the water temp, a hot water valve that takes water directly from the boiler, and a cold water mix valve that introduces cold water to the hot water coming from the boiler before it gets to the outlet.  What you're probably seeing is scale build up inside the hot water valve, thereby not allowing any of the super hot water from the boiler to mix with the cold water from the mix valve.  There isn't much to be done besides take the hot water valve apart and clean it out or replace it.  This would also be a good time to check for scale in the boiler.  7 years of uninterupted service is a likely candidate for some scale related issues in a couple different parts of the machine.  Do you have a Tech company that you generally use?  It might be time to give them a call.

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Permalink Reply by Kim Anderson on February 9, 2013 at 5:53am

Thank you! That's what we were thinking.

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