national multiple family submetering and allocation billing program ...

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Submetering
Method
Efficient
Fixtures?
Table ES.1.9 Cost and benefit per unit analysis for owners who chose to submeter
Annual
Water Use*
(gal/du)
Useful
Life †
(years)
Annual
Value of
Water and
Sewer
Benefits ‡
PV of
Benefits §
Capital or “First” Costs ($/du)
Receiver,
Computer,
and
Software ††
Meter,
Transmitter,
and
Installation **
Fixture
Replacement
‡‡
Annual
Service
Fee §§
Meter
Replacement
***
PV of
Costs †††
Submeter - New
Construction
Yes 52,195 20 $275 $3,428 $125 $25 $0 $ 36 $125 $675 5.1
Submeter - Yes 52,195 20 $275 $3,428 $300 $25 $0 $ 36 $125 $850 4.0
Retrofit No 52,195 20 $275 $3,428 $300 $25 $255 $ 36 $125 $1,105 3.1
POU metering ‡‡‡ Yes 52,195 20 $275 $3,428 $560 $25 $0 $ 36 $300 $1,597 2.1
No 52,195 20 $275 $3,428 $560 $25 $255 $ 36 $300 $1,852 1.9
* Based on the total water use of the average in-rent unit (143.0 gal/du/day)
† Assumes that Automatic Meter Reading (AMR) equipment is used, and that based on current technology, that the battery life is limited to 10 years, and it is best to
replace the entire meter, register, transmitter, and battery at same time (even though standard life for a meter is 15 years). Assumes that POUs will need to be
replaced every 5 years.
‡ Based on a commodity charge for water and wastewater of $5.27 per kgal (the average commodity charge for the thirteen study sites).
§ The present value of annually occurring benefits is calculated with a discount rate of 5%.
** May vary by property and location.
†† Calculated on a per property basis. This assumes a $2,500 base cost spread over 100 units.
‡‡ Includes hardware and installation cost for a dwelling unit that is retrofit with 1.2 toilets for $234, 2 aerators for $4, and 1 showerhead for $17. Not applicable to
dwelling units that have already been equipped with hardware operating within 125% of EPACT standards. Only accounts for the first time cost, does not account for
any ongoing replacement/maintenance schedule at the property.
§§ Assumes monthly service fee of $3 is paid by owner.
*** Replacement costs for submeters (which will be replaced every 10 years) and POU meters (which will be replaced every 5 years).
††† The present value of annually occurring costs is calculated at a discount rate of 5%.
‡‡‡ Assumes 7 meters per apartment, and $80 per meter (includes hardware and installation).
B/C
Ratio