Adding VFD to Fractional Horsepower Hot Water Recirculators

Project Summary

Retrofit by adding VFD controller to fractional horsepower Hot Water Recirculator in single loop domestic use for apartments and hotels, etc. can save gas 15.6% with a compensating but modest increase in hot water usage of 13.4%; or an average gas savings of about 27 therms per apartment unit per year.  A loop in an apartment complex typically services 40 dwelling units.