A heat pump system and method of use are disclosed for cooling or heating utilizing a refrigerant that includes a compressor, an ejector in fluid communication with an output of the compressor, a condenser in fluid communication with an output of the ejector, a throttling valve in fluid communication with an output of the condenser. An evaporator having an input in fluid communication with an output of the throttling valve and an output in fluid communication with an input of the ejector and an input of the compressor. There is also disclosed for data centers, a combination evaporator-OHPs and the second plurality of combination evaporator-ejector OHPs for cooling a plurality of servers where the first plurality of combination evaporator-OHPs and the second plurality of combination evaporator-ejector OHPs each include an adjacent wicking structure that is adjacent to a vapor channel and a liquid channel.