The interest in the polymer (plastic) pipes in terms of their use in district heating networks of large cities settlements and neighborhoods as flexible pre-insulated pipes in the polyurethane foam insulation channel free laying increased in Russia during the last decade. Pipes made of PE-RT (polyethylene of Raised Temperature Resistance) and PE-X (cross-linked polyethylene) are the most promising plastic pipes. Pipes made of PE-RT have long term hydrostatic resistance (ability to prevent the liquid expiration under pressure) at high temperatures, without molecular cross-linking. This resistance provides significant technological advantages (the ability to weld) comparing with the crosslinkable systems (PE-X), as well as pipes cost reduction. The paper presents the method of determining the service life of polymer heat pipelines made of PE-RT and PE-X at a temperature of 110 °C, based on domestic and foreign standards. The analysis of heat pipelines performance made of PE-RT and PE-X and the plastic pipes service life calculation at temperatures up to 110 °C indicate obvious advantages of PE-RT Type II DOWLEX ™ 2388. In addition, the article gives the guidance to developers of the standard GOST R 52134 next edition, based on European regulations and essential for the laying plastic pipe improvement.