Tankless Electric Water Heater

No Tank

Typically come in the 3kW variety, but more advanced ones are 1.8kW. Otherwise, 1.5kW are mini-tank, not true tankless.

• Cheapo point-of-use on-demand electric - 3kW - $68 [1]
• 1.8kW electric on-demand water heater - $159 - comes with aerator, 0.21 gpm activated, limited to 0.32 gpm. [2]. 39F temp rise at 0.32 gpm. [3]
• 3kW on Ebay, $60 - [4]
• 2.6kW - 60F rise at 1GPM - on the shower itself - [5]

Mini Tank

About 1.5 kW - worst of 2 worlds - don't have enough continuous hot water, and waste energy. You can tell by their larger size than true tankless.

• $80 - [6]
• Bosch 2.5 gal - $157 - [7]

Links

• Tankless Water Heater
• Hot Water - will water be warm enough to use?