Heat recovery saves restaurants 30% of their energy costs

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An interesting article in the Toronto Star details the systems some local restaurant chains are installing to recover cooking heat to pre-heat cold water en route to hot water and heating systems. A sophisticated variant had a payback period of 21 months.

The system is supplied by a company that used to install bar and restaurant smoking room ventilation prior to smoking rooms being outlawed in Ontario. In summer when no heating is required the hot water supply water can be preheated to 120F/49C prior to entering the boiler. I've sometimes wondered whether the hot air in a Toronto summer, where nightly lows can exceed 20C could be used in a similar way to integrate into hot water systems downtown, especially given the apparent success of Toronto's Deep Lake Cooling System.

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