Water purification units, water softening units, ionizers for treatment of water in domestic, commercial, irrigation, industrial, agricultural, horticultural and industrial water supply; hot water tanks; water heaters for domestic, commercial and industrial use; water heaters for domestic, commercial and industrial use; water ionizers as heat exchangers; electric coffee pots; electric coffee makers; whirlpools, whirlpool baths and whirlpool jets; showers; irrigation sprinklers; agricultural i...