» Solar domestic hot water
With the rising cost of the fuels
traditionally used to heat water in your home (electricity, natural
gas, propane, and oil), a solar domestic hot-water system can reduce
dependence on your existing water heater by more than 60%
annually in Southwestern Ontario - this is about
3000 kWh per
year with a typical family of four using a solar system with two
collectors. You will see real savings on your utility bills and
also help reduce your carbon footprint.
Have a geothermal system, or thinking
of installing one in the near future? Combining solar thermal
and geothermal together gives a longer lifespan for both
systems, getting you a better bang for your buck. Learn
more about combining solar thermal and geothermal.
The price of natural gas in Southwestern Ontario
went up over 28% this year.
Solar energy delivered based on tilt angle and orientation angle
The chart below shows the average
amount of solar energy (in kWhth)
delivered over the course of a year for a family of four, at varying
tilt and orientation angles. As you can see, an optimal
angle is due south at 30° tilt, but moving to south-east
or south-west results in only a 5% loss of annual
energy; tilting up to 45° facing south results in a miniscule
0.2% loss of annual energy.
||orientation of solar collectors
|solar energy numbers are displayed
- Family of four using 75 L of hot water
per person per day
- Typical meteorological data for London,
- 2 collectors with 272 L storage tank
Frequently asked questions (download
- Will a solar water-heating system replace my existing
To ensure that hot water is available at any time of day year
round, your existing water heater will act as a backup for times
when solar energy is not available, such as at night. Systems
are sized so that solar will deliver most of the energy for generating
- Where can the solar collectors be installed?
Typically, solar collectors are placed on the roof of a building.
If the roof can not be used, collectors can be mounted on a rack
located on the ground, a wall, or on a fence. Shading throughout
the year must also be taken into account.
- How long will an installation take?
Installations can take between one and two days on a home.
- How does a solar water heater save me money?
By offsetting the energy required by traditional sources (e.g.
water heaters powered by electricity, natural gas, and other fossil
fuels), you will reduce your utility bills. You also extend the
life of your existing heater as it will work less.
- How do I optimize the amount of energy collected?
The best orientation for collectors is due south; however,
collectors can be positioned anywhere between south-west and south-east
with negligible loss in performance. You can also get the most
out of solar system by using hot water while the system is producing
- What is the expected lifetime of a solar water-heating
Quality solar water-heating systems offered by SunTap are
designed to last 20 years or more.
- What about the condition of my roof? Does it matter?
If the roof needs replacing, it is highly recommended to have
it replaced before installing solar collectors; otherwise the
collectors will have to be removed and re-installed to accommodate
- How will the collectors look when installed on my house?
Most collectors are designed to blend in with the roof, having
the appearance of skylights.
- Are there any other benefits to installing a solar
If you are planning on selling your home, having a solar water
heater already installed may improve the resale value of the property.
You reduce pollution by offsetting energy consumption, as well.