During the annual servicing of our furnace on Thursday, Reza noticed that a part was about to break, so he ordered a new part and came back Friday to install it. Apparently he missed a step, because although the furnace worked, after he left it warmed the house to well above the thermostat setting. That evening we turned off the electricity and, after a brief consultation with Enercare, telephoned Enbridge about next steps; Winston came, turned off the gas and explained that Enercare should send a technician to solve the furnace problem and bond the gas line.
Mohammed came Saturday, solved the furnace problem and recommended that we take advantage of a current offer from Enercare to rent to us a new water heater (at the same rate that we were paying another company for our 10-year-old water heater, plus providing a handsome rebate); the installers would be able to bond the gas line to the heater at the same time. Sure enough, Matt and Ryan arrived Sunday with the new heater, installed it, bonded the gas line, and took away the old heater, leaving us very satisfied.