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ECONAR® GeoSource® Geothermal Heat Pumps
Frequently Asked Questions about Geothermal Heating and Cooling Systems
What is Geothermal Energy?
What is a Geothermal Heat Pump?
We know a geothermal heat pump can heat, but can it also
cool my home?
How do I get the heat from the ground into my home?
What is an open-loop system?
How much groundwater does an open-loop system need?
What problems can be caused by poor water quality?
Does an open-loop system cause environmental damage?
Are there any laws that apply to open-loop installation?
What is a closed-loop system?
How long will the pipe last?
How are the pipe sections of the loop joined?
What is the fluid in the loops?
What type of ECONAR® Geothermal
Heat Pumps are available?
Can a heat pump provide 100% of my heating and cooling
needs?
Can a geothermal heat pump heat my hot water for my
home?
Do I need to increase the size of my electric service?
Where is this heat pump installed?
How efficient is a geothermal heat pump?
What does a system like this cost? How long is the payback
period for your geothermal heat pump system?
What about comfort?
Can geothermal do snow melting?
Can I heat my pool?
I have a very large house, can your unit heat my home?
What kind of maintenance can I expect?
Is there improved indoor air quality with this system?
How is a heat pump sized?
How do geothermal heat pumps compare to conventional
systems?
Will this system add value to my home?
Is it true that geothermal heat pump systems have
the lowest impact on the environment?
What is the life of a system?
What is ECONAR's®
warranty?
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What is Geothermal Energy?
There are two types:
- High grade
- Low grade
High-grade geothermal energy is the heat of the earth’s pressure
that turns water into stream. Old Faithful at Yellowstone National Park
is an excellent example. Low-grade geothermal energy is the heat within
the earth’s crust. This heat is actually stored solar energy. ECONAR
taps into this low grade geothermal energy and delivers big energy savings
when heating, cooling and making hot water.
What is a Geothermal Heat Pump?
A heat pump is a mechanical device used for heating and cooling which
operates on the principle that heat can be moved from a warmer temperature
to a cooler temperature. A geothermal heat pump uses the earth to warm
us in the winter and cool us in the summer. You already have a heat pump in your home – your refrigerator. If
you put your hand behind it you’ll feel the heat that has been removed
from the food inside the refrigerator. This is the same principle that
ECONAR uses to move heat to and from the home
and earth.
The Technical View of the Heat Pump Process.
Remember that the heat pump moves heat from a low temperature source
to a high temperature source. The process of elevating low temperature
heat to over 100°F and transferring it indoors involves
a cycle of evaporation, compression, condensation and expansion. A refrigerant
is used as the heat transfer medium which circulates within the heat pump.
The cycle starts as the cold liquid refrigerant passes through a heat
exchanger (evaporator) and absorbs heat from the low temperature source
(liquid from the ground loop). The refrigerant evaporates into a gas as
heat is absorbed. The gaseous refrigerant then passes through a compressor
where the refrigerant is pressurized, raising its temperature to over
160º F. The hot gas then circulates through a refrigerant-to-air
heat exchanger where heat is removed and pumped into the home at about
100º F. When it loses the heat, the refrigerant changes back to a
liquid. The liquid is cooled as it passes through an expansion valve and
begins the process again. To air condition, the flow is reversed.
We know a geothermal heat pump can heat, but can it also cool my home?
Yes, one of the reasons a heat pump is so versatile and efficient is its
ability to heat and cool as one system. With a flick of a switch on your
indoor thermostat the geothermal heat pump changes from heating to cooling.
How do I get the heat from the ground into my home?
There are several types of systems that gather the heat from the ground.
The most commonly used are open-loop and closed-loop systems.
What is an open-loop system?
An open-loop system is used less frequently, but may be employed cost-effectively
if ground water is plentiful. Open-loop systems in fact, are the simplest
to install and have been used successfully for decades in areas where
local codes permit. This type of system uses ground water from an aquifer
and is piped directly from the well to the building, where it transfers
its heat to a heat pump. After it leaves the building, the water is disposed
of by one of three methods.
- Surface drainage – to a low area such as a pond, river, lake
or stream, etc.
- Sub surface – to a dedicated drainfield sized to the required
volume of water of the heat pump.
- Re-injection or discharge well - water is pumped back into the same
aquifer through a separate discharge well.
Local environmental officials should be consulted whenever an open-loop
system is being considered.
How much groundwater does an open-loop system need?
Geothermal heat pumps used in open-loop systems need differing amounts
of water depending on the size of the unit and the manufacturer’s
specifications. The water requirement of a specific model is usually expressed
in gallons per minute (g.p.m.) and is listed in the specifications for
that unit. Your water well and heat pump combination should be large enough
to supply the water needed by the heat pump in addition to your domestic
water requirements. ECONAR heat pumps have the smallest water requirement
in the industry, ranging between 1.5 – 2 gallons per minute at 50°
EWT.
What problems can be caused by poor water quality?
Poor water quality will cause serious problems in open-loop applications.
Your water should be tested for hardness, acidity and iron content before
the heat pump is installed. Poor water quality can cause mineral deposits
to build up inside the heat pump heat exchanger and periodic cleaning
will be required. Water from flowing springs, ponds, lakes or river sources
are not recommended for heat pump use, unless proven to be free of excessive
particulate and organic matter. These sediments will contaminate the heat
exchanger heat pump system and make it inoperable.
Does an open-loop system cause environmental damage?
No, the heat pump only moves heat from one source to another, therefore
no pollution is generated. The only change in the water after it's used
by the heat pump is a slight increase or decrease in temperature.
Are there any laws that apply to open-loop installation?
In some localities, all or parts of the installation may be subject to
local ordinances, codes, covenants or licensing requirements. Check with
local authorities to determine if any restrictions apply in your area.
What is a closed-loop system?
Closed-loop systems are becoming most common. There are 5 types of closed
loop systems. All types use a continuous loop where the heat transfer
fluid is circulated. A horizontal loop is usually the most cost effective when adequate yard
space is available and trenches are easy to dig. Using trenchers or backhoes
digging trenches three to six feet below the ground, you then lay a series
of parallel plastic pipes. The trench is then back filled, taking care
not to allow sharp rocks or debris to damage the pipe. A typical horizontal
loop will have 400-600 feet of pipe per ton of heating and cooling capacity.
Vertical loops are preferred in many installations where yard space is
insufficient and where preservation of existing landscaping is desirable.
Contractors bore vertical holes in the ground 150-450 feet deep. Each
hole contains a single loop of pipe with a U-bend at the bottom. The hole
is then backfilled or grouted to improve the thermal conductivity. Each
vertical pipe is then connected to a horizontal pipe underground to and
from the heat pump. Vertical loops are generally more expensive to install,
but require less piping than horizontal loops.
Slinky loops are used to reduce the heat exchanger per foot trench requirements
but require more pipe per ton of capacity. This pipe is coiled like a
slinky, overlapped and laid in a trench. Two-pipe systems may require
200-300 feet of more pipe per ton of nominal heat exchange capacity. The
trench length decreases as the number of pipes in the trench increases
or as slinky overlap increases.
Pond loops are a special kind of closed loop system. Where there is a
pond or stream that is deep enough and with enough flow, closed loop coils
can be placed on the bottom. Geothermal transfer fluid is pumped just
as a closed loop ground system. First cost economics are very attractive
and there is no aquatic environmental impact.
Geothermal heating and cooling systems can be connected to the earth
in a variety of ways. High system performance is dependent upon good installation
practices. ECONAR’s highly trained authorized dealers are professionals
who understand local codes and conditions. Visit our where to buy area
and you’ll find an ECONAR authorized dealer who can discuss the best
system for you.
How long will the pipe last?
A high-density polyethylene pipe is used in a closed loop system and has
a 50-year warranty. Independent tests show a useful life span of over
200 years.
How are the pipe sections of the loop joined?
Thermal fusion and stab fittings are the only acceptable method used to
connect pipe sections. Thermal fusion connections are either socket or
butt fused together to form a joint stronger than the original pipe. Stab
fittings are fairly new but are proving themselves to be reliable. Using
barbed fittings, clamps and glued joints are unacceptable and will eventually
cause the loop to leak and fail.
What is the fluid in the loops?
There are two types of antifreeze solutions that are used: propylene glycol
and methyl alcohol. These heat transferring solutions are mixed with water
to form a solution for your specific climate and ground conditions. ECONAR’S
GTF (geothermal heat transfer solution) is the most widely used and industry
accepted. GTF is a mixture of methyl alcohol and water.
What type of ECONAR Geothermal Heat Pumps are available?
ECONAR offers you the most efficient, comfortable, reliable and quiet
heat pump available today. With installations for both commercial and
residential projects, our complete line includes Forced Air, Hydronic,
Combination, dual stage (Invision3), Domestic Hot Water and Commercial
Consoles.
Forced air heat pump systems
are commonly used in homes today. Conventional ductwork distributes hot
or cold air and provides humidity control.
Hydronic heat pumps heat or
chill water which is used in a wide variety of distribution systems including:
radiant floor, cast iron radiators, baseboard hydronic, and fan coils.
Typical applications are residential, commercial, and industrial. Other
uses are: ice rinks, fish farms, snow melt, car washes, dairy farms or
any other application that requires heated or chilled water.
Combination heat pumps
offer the best of both forced air and hydronic in one unit. In addition
to the standard forced air heating and cooling capabilities, the ECONAR
combo also offers hydronic distribution for operations such as radiant
floor, cast iron radiators, baseboard hydronic and fan coils.
Invision3 is ECONAR’s
most advanced geothermal heat pump. The dual circuit design allows for
separate compressors to run independently of each other. The Invision3
allows two stages of heating and two stages of cooling or two stages of
heating with one stage of cooling with 100% on demand domestic hot-water.
A variable speed DC blower offers softstarting, 12 selectable speed changes
and improved temperature control.
ECONAR’s Water Heater
heat pumps are designed for both residential and commercial applications.
For heavy hot water usage such as a whirlpool or hot tub, it has the ability
to heat more water than a conventional water heater, and saves you money.
For extended water usage, such as hospitals, schools, industrial facilities,
car washes and laundromats the domestic water heater is perfect.
Console heat pumps are free standing units that do not require
a distributing system. They are aesthetically appealing, as are used in
applications such as: hotel rooms, class rooms, churches, warehouses and
industrial work areas.
Can a heat pump provide 100% of my heating and cooling needs?
Heat pumps can provide 100% of your heating and cooling requirements.
All heat pumps will show significantly improved energy efficiency; however
some are designed for higher heating loads while others are biased towards
higher cooling loads, still others like ECONAR provide a more balanced
approach. These factors combined with your geographical region can have
a large impact on the economics.
Can a geothermal heat pump heat my hot water for my home?
Domestic hot water is available with the use of a heat pump for pennies
a day or even free. A hot water desuperheater is a heat exchanger built
into the heat pump and is designed to remove high temperature heat from
the refrigerant gases. A typical hot water desuperheater will generally
provide 120° F water and can supply most of the domestic water needs
depending on the amount of consumption. In buildings with larger requirements
for hot water, ECONAR builds heat pumps that will provide hot water savings
in commercial and industrial applications.
Do I need to increase the size of my electric service?
Most homes already have adequate electrical service. ECONAR’s low
energy requirements make it ideal for new construction as well as retrofit
installations.
Where is this heat pump installed?
ECONAR heat pumps are located indoors. This is very appealing for many
reasons. Indoor installations free up outdoor space allowing better architectural
design and yard usage. Noise normally associated with outdoor condensers
is eliminated and because the electrical controls and heat exchanger coils
are protected from the elements this then allows greater system longevity.
How efficient is a geothermal heat pump?
If I said up to 500% efficient, would you believe me? Yes that’s
right. Depending on individual circumstances savings can be that high.
On average though operating costs with ECONAR heat pumps are about 75%
less than electric heating devices and 50% less than air source heat pumps.
Cooling costs are 25% - 50% lower when compared to conventional air conditioners.
In addition, because hot water is supplied by the heat pump at these efficiencies
and higher, your overall savings are increased even more.
What does a system like this cost? How long is the payback period for
your geothermal heat pump system?
This, of course will vary greatly depending on individual circumstances,
but on average a typical home of 2000 square feet will cost between $10,000
- $15,000. This represents somewhere around double the costs of a conventional
heating, cooling and hot water system. When it comes to payback, we at
ECONAR often see a 3 – 5 year payback of these additional costs.
Then it’s money in the bank from that point on.
What about comfort?
Cost savings aside many people say you can’t beat the comfort of
an ECONAR heat pump. Because we train our dealer contractors to install
ECONAR products to our highest standards you end up with the most efficient
and comfortable heating system available today.
Can geothermal do snow melting?
Yes. Snow melting on sidewalks and driveways is becoming more fashionable
and can be incorporated into the overall geothermal system design.
Can I heat my pool?
Yes. Indoor and outdoor pools are easily heated inexpensively with ECONAR
heat pumps.
I have a very large house, can your unit heat my home?
Yes. ECONAR systems have been designed for homes as large as 20,000 square
feet. The owner of a 1500 square foot house can expect to pay $30 to $50
per month to heat and cool in most U.S. climates. Whatever the size ECONAR
can do it.
What kind of maintenance can I expect?
A properly installed ECONAR closed-loop heat pump requires very little
maintenance aside from regularly maintaining the air filter and air blower
assembly. Water coil maintenance is recommended on open-loop installations
as water quality can greatly affect the heat exchanger efficiency.
Is there improved indoor air quality with this system?
Yes. An all-electric heat pump system produces no products of combustion
therefore no indoor air pollutants are possible. Conventional gas and
propane systems require chimneys to vent away harmful carbon monoxide
and other dangerous gases.
How is a heat pump sized?
ECONAR’s® qualified and trained dealer
contractors will size your heat pump based on an accurate heating and
cooling analysis of the home or building. Factors like the type of windows
and insulation R. values are taken into account and a BTU per hour
heat loss and heat gain will result. The heat pump is then sized and will
keep you warm during the coldest winter night and cool on the hottest
summer day.
How do geothermal heat pumps compare to conventional systems?
Although heat pumps normally cost more to install over conventional systems
the increased comfort, lower energy and maintenance costs result in customer
satisfaction. Mostly all people surveyed said they would recommend an
ECONAR® heat pump to a friend or relative.
Will this system add value to my home?
Yes. More and more Home Appraisers and Real-estate Agents are educated
and acknowledge a geothermal system as a renewable energy source with
greater value.
Is it true that geothermal heat pump systems have the lowest impact
on the environment?
Yes. ECONAR heat pumps only move the heat from one place to another. Because
only a fraction of the energy generated is consumed by the heat pump,
it therefore has a very low impact on the environment.
What is the life of a system?
Experts believe 18-23 years of serviceable life is expected from
ground source heat pumps. This is nearly double that of conventional systems.
What is ECONAR's warranty?
Only the best in the industry.
Residential Installations:
- 2 years parts
- 5 years refrigeration components
- Lifetime heat exchanger
Commercial Installations:
- 1 year parts
- 5 years refrigeration components
View ECONAR's warranty
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