Marathon Water Heaters
Marathon Advantages
- Marathon FAQs - Contact
Cooperative Light & Power

The Marathon
electric water heater offers these advantages:
- Technologically advanced design is clearly differentiated
from short lived steel water heaters.
- It’s the most durable water heater made,
with a warranty to match
Envirofoam™ insulation is completely free of
CFC and HCFC ozone depleting gases. Marathon leads
the way in environmental friendly manufacturing, design
and operation.
- Tank comes complete with a factory installed vacuum
relief valve, ¾" brass tee and ¾"
brass nipple for easy, professional installations.
- Replaceable brass drain valve
- All wiring run in conduit for easy control wiring
- Seamless blow molded polybutylene tank with no anode
rod required for a corrosion free life
- High temperature, commercial-grade diptubes for
greater durability
- The filament wound fiberglass outer tank is designed
to be more flexible and withstand more pressure than
conventional tanks Our unique high temperature dip
tube is offset from the concave bottom, creating a
"whirlpool effect" which helps prevent sediment
build-up
- Every tank includes 4' of pipe insulation for even
greater savings.
FREQUENTLY ASKED
QUESTIONS
How much more is the Marathon than a conventional
water heater?
The smaller Marathon units will cost approximately
2 to 3 times more than a basic steel water heater. That
is not a real comparison though, as you are comparing
a lifetime warranty product that is super insulated,
against a 5 or 6 year warranty product with minimal
insulation. Installation for the Marathon is no more
and sometimes less than for steel units.
Larger units such as the 85 and 105 gallon models are
typically the same cost or less than short-lived steel
units. Our manufacturing process is technologically
advanced and very efficient so our incremental cost
between our smaller tanks and our larger ones is much
smaller than that of steel tanks.
Is it worth more than a conventional water
heater?
Yes. Typically it will pay for itself in energy savings
over a conventional water heater. The Marathon will
save you energy year after year and after five years
it won't have to be replaced. The cost of the water
heater is usually only half your cost however. Installation
is the other cost and you won't have to pay for that
and another water heater in five years. The other thing
people often overlook is the damage to their floor and
belongings when their cheaper water heater fails.
Why should I bother, my last water heater lasted
22 years?
That's impressive but not uncommon for older water
heaters. Older water heaters had much thicker steel
and more porcelain than today's units. Because manufacturers
have cut so many costs from the manufacturing process,
most steel water heaters made today will not last much
longer than their warranty.
I am building a new house, wouldn't gas be
cheaper?
Not necessarily. Although gas may be slightly cheaper,
gas water heaters are more expensive than electric units
and the venting now required for safety can be quite
expensive. The thing to remember is that electric water
heaters are nearly 100% efficient, as all of the heat
generated stays in the unit instead of some going up
the flue. Also, the Marathon is like a Thermos®
in that it keeps the water hot once you have made it.
It's the most efficient water heater made.
Many people are now building tighter, more efficient
homes than they used to and indoor air quality is becoming
a concern. Any fossil fuel water heater can be a problem
with carbon monoxide, NOX, and other pollutants needing
to be vented. You can eliminate this issue entirely,
however, with the energy-efficient, electric Marathon
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