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3
HOW IT WORKS
A closer
look at the
comparison
Seriously. When you consider the space savings,
eco-efficiency and endless supply of hot water
that come with tankless technology, there is
no comparison. But when you look at the cost
savings over the long run, well, it just keeps
getting better. More comfort for less money?
Talk about a no-brainer.
WATER HEATER OPERATING COST COMPARISON
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STANDARD
TANK
• Large tank
requires more
installation space
and management
• Water in tank
is heated and
reheated to
maintain desired
set temperature
regardless of
usage or demand
• During times of
heavy use, water
can be depleted,
causing delays in
hot water supply
• In the event
of tank failure,
large amounts of
stored water can
cause extensive
damage to the
home
HOT WATER OUTLET COLD
WATE R
INTAKE
GAS INTAKE
SUPER-HIGH-EFFICIENCY
TANKLESS
• Cold water enters inlet pipe only when hot
water is required
• Gas ignites heat exchangers, which heat
the water
• Heated water exits hot water outlet to travel
through pipes to where it is needed
• Heater will adjust flame output as needed to
ensure a temperature set point is maintained
• When no more hot water is required, system
shuts off until hot water is needed again
Rinnai’s line of digital controllers allows
you to set water temperature precisely
for multiple locations in your home.
If you grew up in a home with lots of people taking showers and running appliances, you’ve probably
experienced what it feels like when that big tank runs out of water. Not too fun, is it? So how can this
box, about the size of a suitcase, mounted to your wall keep your showers hot and your tubs full?
Tankless vs. Tank
TANK TECHNOLOGY
FUEL TYPE/ENERGY SOURCE EF (ENERGY FACTOR) ANNUAL OPERATING COSTS*
STANDARD 50-GALLON GAS STORAGE TANK NATURAL GAS 0.60 $273
STANDARD 50-GALLON GAS STORAGE TANK PROPANE 0.60 $658
STANDARD 50-GALLON ELECTRIC STORAGE TANK ELECTRICITY 0.95 $555
TANKLESS TECHNOLOGY
FUEL TYPE/ENERGY SOURCE EF (ENERGY FACTOR) ANNUAL OPERATING COSTS*
HIGH-EFFICIENCY NON-CONDENSING TANKLESS NATURAL GAS 0.82 $199
HIGH-EFFICIENCY NON-CONDENSING TANKLESS PROPANE 0.82 $482
SUPER-HIGH-EFFICIENCY CONDENSING TANKLESS NATURAL GAS 0.96 $170
SUPER-HIGH-EFFICIENCY CONDENSING TANKLESS PROPANE 0.96 $412
*As based on the average cost to run an electric tank water heater per the Department of Energy (DOE) Average Energy Costs (doe.gov)
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