SUPPLIED/Supplied Cartwright, a certified gas-fitter, was responsible for certifying Hale’s work. Brendon Walker, Jesse’s uncle, purchased the Bosch gas hot water unit in September 2016, and was told by the retailer that it was suitable for the small bathroom unit. The bathroom was initially used at Walker’s home in Alexandra while his property was being renovated. A shower, basin, toilet and sliding window were later added. The gas water heater was described as an open flued instantaneous water heater. It worked by taking fresh air from the room it was installed in, and used that air for combustion, the summary said.