Heat pump termodynamic analysis show that if outgoing heat had low temperature than efficiency will increase and cost of heat will drop. However low temperature of heat pump produced heat become limitation for such heat source application.Heat pump efficiency possible to increase if to apply internal combastion engine for Heat pump compressor drive. Economical effect created by outlet gase heat utilization And heat potential increase. Heat energy produced by heat pump with internal combastion engine drive could be two time less expensive than heat energy from direct gas burning.