Amazon gives high rankings to the InSinkErator, Sunbeam and Waste King hot water dispensers. Best Water Heater Reviews ranked Waste King, InSinkErator and Kohler as the top three best instant hot water dispensers.
Hot water dispensers come in two varieties: models that integrate into the faucet and models that sit on the countertop. The integrated models carry a higher price and can require professional installation, but deliver hot water on demand because they have a tank mounted underneath the sink. Sunbeam makes countertop models which require some time for water to heat, but can be an ideal choice for consumers who do not plan to use this appliance every day.