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Ottawa affordable-housing high-rise plans wastewater heat recovery

February 12, 2019 – Claridge Homes has contracted Sharc Energy Systems and Argus Environmental to deploy Sharc’s wastewater heat recovery technology (example pictured) for an all-electric affordable housing development in Ottawa.


February 12, 2019
By Peter Saunders
Peter Saunders

Canada Mortgage and Housing Corporation (CHMC) is financing the $70.8-million high-rise rental development at 70 Gloucester Street, which will comprise 227 rental housing units on 27 storeys, more than 200 of which will offer rents lower than 30% the local median household income. The all-electric building, which will not use natural gas for heating, is projected to yield energy-efficiency savings of 50%.

The building will use Sharc’s Piranha T10, which is designed to produce 6,000 gallons of hot water per day. Its self-contained heat pump uses a direct expansion heat exchanger to extract thermal energy from wastewater, rather than lose it down the drain and into the sewer. The water will act as a source for the heat pump, which will then be used to heat incoming cold water for future loads, significantly reducing the high-rise’s energy requirements.

Delivery and installation of the system are planned for the second quarter (Q2) of 2019. Sharc, which is headquartered in Port Coquitlam, B.C., hopes this first installation in Ottawa—and the first of its kind to improve energy consumption for public housing—will lead to more projects in Ontario with Hamilton-based Argus.

“We are proud and excited to introduce Piranha into the Ontario marketplace and expect it to become the system of choice for all buildings in the future,” says Rick Lawlor, principal at Argus.