Domestic hot water
In many multi-family buildings, hot water comes from common
hot-water boilers, rather than from individual water heaters as
in single-family homes. These large tanks are typically set to
60°C (140°F), but this can be dropped by a few degrees to a
lower safe level, such as 55°C (131°F), to save on energy. CMHC
estimates the savings in fuel consumption at 1% per degree
LED exit signs can last about 25 years,
but do have a higher initial cost. Using
CFL bulbs in an exit sign would typically
last between two and four years, and
incandescent bulbs would require
replacing several times a year.
Celsius (or 2.5 degrees Fahrenheit). However, the Canada Safety
Council recommends that the water temperature be set to at
least 54°C (129°F) to prevent water-borne diseases.
In addition, buildings equipped with domestic hot water
recirculation pumps can further benefit from a timer that shuts
off the pump during periods when there is little demand for hot
2. A 24-hour mechanical time clock allows the user to set
different on- and off-times during the day, such as in the middle
of the night or for part of the afternoon. Should a resident want
hot water during shutdown, she or he must simply run the water
long enough for the hot water to make its way to the tap. A
seven-day time clock adds the possibility to accommodate for a
different shut-off period for weekends.
Also, the hot-water boiler should be flushed annually by an expert
to remove residues and deposits that have accumulated inside.
This will help keep heating costs down and will significantly
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