Bosch Combi 151 Very low hot water flow at all faucets

jslone80

I recently purchased a home with a wall mounted Bosch 151 that was installed in Dec. 2016. My system is on a well. The cold water comes out of the faucet with great pressure but when you switch to using the hot water the flow drastically decreases. i would say by more than half.

Any thoughts on what could be causing my issues?

Alan (California Radiant) Forbes

Is this hot water flow problem only at one faucet or all of them?

hot_rod

Could be a strainer on the cold supply somewhere. The manual would show the location and cleaning instructions.

Or the HX could be liming up and require a acid flush. There are kits available to flush them with a pump and cleaner in a plastic bucket.m

Jamie Hall

Or is there a mixing valve somewhere which is stuck?

Tom_133

There is a brass tee that is shipped with the unit that would be installed on the domestic side. As hot rod mentioned thats the best place to start. Shut off water at well, drain off pressure, and remove nut on the wye strainer, there is a tube in there you can pull out and clean.