Who makes geothermal natural gas powered heat pumps? Does anyone have any
experience with an oil or natural gas powered heat pumps (geothermal or
Thank you for your time and energy,
I might be able to get a low interest loan from the government for the money
used to purchase the units. When the capital costs for the units are
artificially low sometimes it makes since to do things that otherwise would
not be economically sound.
Your tax dollars at work,
"A I understand it" heat pumps are more than 100% efficient in suitable
Yes, they are. Natural gas heat pumps have an efficiency of about 140%.
The Peerless natural gas boiler I installed last week had an efficiency of
about 80%. Geothermal heat pumps have an efficiency of about 345%. The
reason for this increased efficiency is that they are transferring heat from
a liquid at ground water temperature (55 deg year round where I live)
instead of the outside air (currently 12 deg). Geothermal heat pumps don't
require a "suitable climate".
You asked why you wouldn't use a natural gas heat pump. You wouldn't use
one because the up-front costs and increased complexity of the unit aren't
covered by the energy savings. Sometimes up-front costs for traditional
natural gas systems are prohibitive and electric is installed.
The natural gas heatpump that I had some connection with did not use a
natural gas motor, only electric motors. It used natural gas for a source
of energy for the change of state. Note I believe they must use Ammonia for
the coolant and I am not at all sure if they would be reversible.
Neither electric nor gas motors are 100% efficient at converting electricity
or gas into mechanical energy. Electric motors are closer than gas motors
because gas motors give off more waste heat. In this case the "waste heat"
is usable so it isn't as much as a problem.
Hope this helps,
For the purpose of heating efficiency is generally measured as
BTU heat output / BTU fuel purchased.
You get 100% efficiency with vent-free gas heaters.
You get over 100% efficiency with heat pumps. The is because some of the
"BTU heat output" comes from the air outside of the house rather than the
fuel purchased. This is why over 100% efficiency is possible -- even with
Hope this helps,
Obviously, what you really want to know is how much you are paying
to heat your house. The cost of gas versus the cost of electricity
determines which one is most economical.
In most areas of the United States today, natural gas is MORE
economical to heat their homes than heat pumps. Some geothermal
units are more economical on an energy used basis, but not enough that
the extra installation and maintenace cost are ever recovered.
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