Multi-residential building with 223 units
In-suite water recommissioning program:
- High-efficiency showerheads and faucet aerators installed
- Toilet flappers replaced and toilets adjusted
- Leaking fixtures repaired or replaced
- Hot water use reduced, saving natural gas
- Daily water monitoring to track performance and protect results
Project Results
| Water Savings: |
$110,800 per year (28%) |
| Natural Gas Savings: |
$36,600 per year (28%) |
| Total Utility Savings: |
$147,400 per year |
| Project Cost: |
$35,800 |
| Return on Investment: |
3 month payback period |
209 tons of natural gas is being saved annually as a direct result of this work, which is equivalent to removing 44 cars from the road!
Daily Water Profile
Multi-residential building with 299 units
In-suite water recommissioning program:
- High-efficiency showerheads and faucet aerators installed
- Toilet flappers replaced and toilets adjusted
- Leaking fixtures repaired or replaced
- Hot water use reduced, saving natural gas
- Daily water monitoring to track performance and protect results
Project Results
| Water Savings: |
$64,500 per year (26%) |
| Natural Gas Savings: |
$8,100 per year (16%) |
| Total Utility Savings: |
$72,600 per year |
| Project Cost: |
$38,530 |
| Return on Investment: |
6 month payback period |
51 tons of natural gas is being saved annually as a direct result of this work, which is equivalent to removing 11 cars from the road!
Daily Water Profile
Multi-residential building with 221 units
In-suite water recommissioning program:
- High-efficiency showerheads and faucet aerators installed
- Toilet flappers replaced and toilets adjusted
- Leaking fixtures repaired or replaced
- Hot water use reduced, saving natural gas
- Daily water monitoring to track performance and protect results
Project Results
| Water Savings: |
$36,400 per year (21%) |
| Natural Gas Savings: |
$13,700 per year (20%) |
| Total Utility Savings: |
$50,100 per year |
| Project Cost: |
$30,700 |
| Return on Investment: |
7 month payback period |
68 tons of natural gas is being saved annually as a direct result of this work, which is equivalent to removing 14 cars from the road!
Daily Water Profile
Multi-residential building with 62 units
In-suite water recommissioning program:
- High-efficiency showerheads and faucet aerators installed
- Toilet flappers replaced and toilets adjusted
- Leaking fixtures repaired or replaced
- Hot water use reduced, saving natural gas
- Daily water monitoring to track performance and protect results
Project Results
| Water Savings: |
$16,100 per year (33%) |
| Natural Gas Savings: |
$2,100 per year (20%) |
| Total Utility Savings: |
$18,200 per year |
| Project Cost: |
$7,000 |
| Return on Investment: |
5 month payback period |
13 tons of natural gas is being saved annually as a direct result of this work, which is equivalent to removing 3 cars from the road!
Daily Water Profile
Multi-residential building with 1102 units
In-suite water recommissioning program:
- High-efficiency showerheads and faucet aerators installed
- Toilet flappers replaced and toilets adjusted
- Leaking fixtures repaired or replaced
- Hot water use reduced, saving natural gas
- Daily water monitoring to track performance and protect results
Project Results
| Water Savings: |
$224,000 per year (29%) |
| Natural Gas Savings: |
$74,600 per year (27%) |
| Total Utility Savings: |
$298,000 per year |
| Project Cost: |
$377,400 |
| Return on Investment: |
1.3 year payback period |
391 tons of natural gas is being saved annually as a direct result of this work, which is equivalent to removing 83 cars from the road!
Daily Water Profile
Multi-residential building with 132 units
In-suite water recommissioning program:
- High-efficiency showerheads and faucet aerators installed
- Toilet flappers replaced and toilets adjusted
- Leaking fixtures repaired or replaced
- Hot water use reduced, saving natural gas
- Hourly water monitoring to track performance and protect results
Project Results
| Water Savings: |
$27,300 per year (21%) |
| Natural Gas Savings: |
$5,300 per year (11%) |
| Total Utility Savings: |
$32,600 per year |
| Project Cost: |
$12,860 |
| Return on Investment: |
5 month payback period |
As a result of repairing and replacing leaking fixtures, the leakage ratio was also reduced by 25%.
Daily Water Profile
Hourly Water Profile
Multi-residential building with 112 units
Enhanced ASHRAE Level 2 audit:
- Analysis of historical electricity, gas and water consumption
- Assessment of boiler plant efficiency and performance
- Complete catalogue of electricity uses including fans, pumps, lighting and elevators
- Measurement of in-suite water consumption
Opportunities identified:
Six conservation measures identified. Estimated cost of $64,000 and expected savings of $41,000 per year, providing 1.5 year payback.
- Heating Control, Mixing Valves & Ventilation
- Variable Speed Drives for Ventilation Control
- Parking Garage Ceiling Insulation
- In-Suite Water Recommissioning
- Efficient Lighting and Control
In-suite water recommissioning program:
- High-efficiency showerheads and faucet aerators installed
- Toilet flappers replaced and toilets adjusted
- Leaking fixtures repaired or replaced
- Hot water use reduced, saving natural gas
- Daily water monitoring to track performance and protect results
Water Recommissioning Results
| Water Savings: |
$29,700 per year (32%) |
| Natural Gas Savings: |
$2,200 per year (11%) |
| Total Utility Savings: |
$31,900 per year |
| Project Cost: |
$15,800 |
| Return on Investment: |
6 month payback period |
14 tons of natural gas is being saved annually as a direct result of this work, which is equivalent to removing 3 cars from the road!
Multi-residential building with 128 units
Completed May 2012
Advanced building automation system & sensors:
- Installed web-accessible automation system
- Intelligent boiler control algorithms
- Temperature sensors in garage
- Additional monitoring of solar thermal system
Targeted improvements in building envelope:
- Four inches of insulation on the garage ceiling
- Increased ground level floor temperatures
- Reduced overall building heating requirement
Interval Data Optimization and Performance Surveillance:
- Tracking energy use every day, every hour
- Using performance feedback to optimize energy output
- Eliminating energy waste and maximizing results
Project Results
| Natural Gas Savings: |
67,000 m3 per year (28%) |
| Reduction in Utility Costs: |
$20,000 per year |
| Project Cost: |
$16,000 |
| Return on Investment: |
10 month payback period |
Additional Benefits:
- Improved resident comfort and reduced overheating
- Reduced staff maintenance and workload
- Ongoing Performance Surveillance to protect savings
Multi-residential building with 78 units
Completed December 2014
Low-cost mechanical upgrades:
- Added boiler protection valves
- Created primary-secondary system
- Reduced wear to boilers
- Reduced energy output to building
Advanced building automation system & sensors:
- Installed web-accessible automation system
- Intelligent boiler control algorithms
- Temperature sensors in suites and garage
- Snow sensor to control snowmelt system
Interval Data Optimization and Performance Surveillance:
- Tracking energy use every day, every hour
- Using performance feedback to optimize energy output
- Eliminating energy waste and maximizing results
Project Results
| Natural Gas Savings: |
50,000 m3 per year (36%) |
| Reduction in Utility Costs: |
$15,000 per year |
| Project Cost: |
$22,100 |
| Return on Investment: |
1.5 year payback period |
Additional Benefits:
- Improved resident comfort and reduced overheating
- Reduced staff maintenance and workload
- Ongoing Performance Surveillance to protect savings
