I have a two stage Burnham boiler (160F/180F) with an Everhot indirect
(coil based) hot water tank. There are separate circulators for the
heat (Bell & Gossett) (fhw) and the hot water (Taco F5). There is a
Watts Tempering Valve set at 150F (Factory Setting) it was changed two-
three years ago along with the Everhot tank. Tenants are complaining
that from time to time, the water fluctuates in temp between hot and
cold, when taking a shower.
What could be the problem? Where should I look, any ideas?