30 posts and a lot of incorrect information.
A tankless/instant hot water is just that, no 60 gallon tank of water you heat all day long wether using it or not. The second you turn on a tankless/instant water heater it heats the water going thru the line, but all the water in the lines after the tankless water heater has to exit before the hot water is at the faucet.
If you want instant hot water at the faucet right when you turn it on, there are a couple ways to do this:
1) put a recirculating pump that circulates the hot water in the pipes so heated water is at the faucet
2) put separate tankless/instant hot water heaters in all the bathrooms/kitchen/laundry room so you don’t have any cold water in the lines at the faucet.
Some of the issues with tankless/instant hot water products, the most efficient are gas units. A little unit to get you instant hot water for tea or a bathroom faucet can be a small electric unit but a unit for a bathtub or shower, you need a bigger unit.
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