I am looking to install a new hot water system for pottable water only. I do not want to have a cistern or large heater. It has to be Electric and it has to feed 2 sinks and a tub/shower. Very low usage so I do not need the water heating up in a tank. Only needed when taps running. What is the best system or model to use?

I am looking to install a new hot water system for pottable water only. I do not want to have a cistern or large heater. It has to be Electric and it has to feed 2 sinks and a tub/shower. Very low usage so I do not need the water heating up in a tank. Only needed when taps running. What is the best system or model to use?
Click on;Tankless Water Heater Buying Guide (http://www.tanklesswaterheaterguide.com/) to see a article that may just give you a answer. Gppd luck, Tom