Adding VFD to Fractional Horsepower Hot Water Recirculators

Project Number: 
ET12SCG0003
Start Year: 
2012
End Year: 
2013
Markets Segments: 
Commercial
Commercial Office
Educational Facilities
Government - Institutional Facilities
Hospitality
Residential
Project Type: 
Gas Energy Savings
Type of Technology: 
Hot Water, Commercial
Hot Water, Residential
Organization: 
Southern California Gas (SCG - a Sempra utility)
Project Status: 
Completed
Savings Type: 
Home
Work

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.

PDF Report: 
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