下给式双管热水供暖系统

two pipe direct downfeed system

双管下给式热水供暖系统

two-pipe hot water downfeed system

热井(锅炉供水系统的)

тёплый ящик

蓄水塔一个处于高处的用以维持某系统的稳压或供给状况的水箱或漏斗，尤指将水供给中央供暖系统的小水箱

A raised tank or hopper that maintains a constant pressure or supply to a system, especially the small tank that supplies water to a central heating system.