Factors such as economy,environment protection,energy saving and reliability should be considered comprehensively for the selection of household hot-water heater.

Optimizing option of medium-high temperature refrigerants in air-source heat pump water heater;

Review on the development of carbon dioxide heat pump water heater system and its compressor;

Present state and perspective of CO_2 air source heat pump water heater;

Tech-economic comparison between domestic solar water heater and solar water heating systems;

The relation between ratio of water mass to area of solar energy collector and average daily efficiency in domestic solar water heaters;