Instant hot water?

[TikiPatrick]

I want to get an instant water heater to replace my factory 10 gal tank.
I'm looking at the Gerrard because the price is half of the Precision Temp.
I'm seeing a lot of mixed revues however, and I would like some more opinions,
please.
I'm also wondering what source of the 12 volt ignition would be, as the tank is purely mechanical.
Thank you in advance,
TikiPatrick

[tlsmit1]

We have an Atwood demand heater. It's worked well for us for the one year that we've had it.

The usual caveats apply: it will not turn on for very low hot water flows, and there is some temperature fluctuation as the flame cycles on and off. It heats up very quickly though: you start to get hot water essentially as soon as water from the heater reaches the tap.

Our unit definitely requires 12 V. The ignition uses 12 V power, and there is also a small exhaust fan (like for a desktop PC) that kicks on when the flame ignites.