You are reading a single comment by @ffm and its replies.
Click here to read the full conversation.
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
ffm
The thing you're describing is called an instantaneous water heater, and they come in endless shapes and sizes, tanked and tankless.
(tankless ones use no power when the tap isn't running, but need a high amp electricity connection if you want more than a warm dribble)