Refrigerant gas. Not natural or propane gas.
All the heat pumps that I know of are electric. Some may have gas backup-- in very cold conditions , heat pump will not work, so some kind of backup is needed.
Heat pump pool heaters use electricity to capture heat. As the pool pump circulates the water, it is drawn from the pool and through a filter and into the heat pump heater. The heater itself has a fan that pulls in outside air and pushes it over the evaporator coil. At this point liquid refrigerant in the evaporator coil absorbs the heat from the outside air converting it into a gas. The gas is then passed through the compressor where it increases the heat. This very hot gas is then sent through the condenser where the hot gas is transferred to the cool pool water circulating through the heater. The heated water is then returned to the pool. A pool heater on the other hand uses the gas directly to heat the water by fueling the combustion chamber.
Your location matters. If in Florida heat pump in more northern climes furnace & ac.
A heat pump is a heating system that applies the principle of refrigeraation to heating homes. These principles are: 1. when a gas is quickly compressed, it's temperature rises; 2. when a gas is allowed to expand suddenly it's temperature fallls; 3. when a liquid evaporates, it absorbs heat; and 4. when a gas condenses it releases heat.
Many HOMES use natural gas for heat
An electric heat pump needs heat available to pump. If it is 30 degrees outside, heating a spa to 102 or so, may be impossible unless the heater has some type of alternative heat source. A properly sized, gas fired heater can take care of a larger range of heating needs. A combination heat pump and natural gas heater, probably with a controller, really makes the issue more difficult, expensive, and would require a lot of study for efficient, cost effective operation. Bottom line: In really mild climates a heat pump might do the job. In cooler climates the gas heater rules. And where a wide range of temperatures and high heat demand is wanted by the customer, a gas heater is the only way to go. A backup heat pump may take years to payout. HM Louisiana
A valve is used to reverse the flow of freon. In the heat mode, the high or hot side gas is pumped to the indoor unit, The low or cold side is pumped to the outdoor unit. The valve is reversed for the cool mode. Pumping cool gas to the indoor unit and hot gas to the outdoor unit.
Yes, as long as it a gas system and not a electric heat pump system
yes
to pump out liquid or gas in higher quantity
No. generally a booster pump is used to run a pressure side cleaner.
There is still enough heat in the air to run your heat pump when the temp is in the 30,s