block heater

基本解释

By the structure features of fixed block of water heater container, the forming die was optimized.
根据热水器水桶固定架工件结构特点，优化设计了成形模。
rjggy.net
HGT series dry block heater is popular used in laboratory for heating test tubes and other micro containers.
HGT 系列干式恒温器一般作为实验室加热试管或其它微小容器的常规装置。
A block heater, which is designed to heat the engine and can cost under $30, on a timer set to start one to two hours before driving, does the trick in very cold climates.
用于加热引擎的缸体加热器，带有定时器，设置好于开车前一到二小时启动，其成本通常不超过 30 美元，在非常冷的天气使用很管用的。