On-Demand Water Heater

Has anyone ever seen an on-demand type heater in-line with (pre-heating) a conventional electric water heater? Any idea why anyone would do this?

Netik 179.jpg

I would assume to try an increase their hot water usage.

I installed one once for a factory rep that wanted to try it out in his own house but never did hear any feedback results.

I don’t recall ever seen such a sloppy installation as that.
What a mess. :neutral:

i agree.
tankless water heaters can only raise water temp so much, depending on usage.
feed it warmer water and it will keep the temp up for longer.