need on demand hot water heater

I am wondering what my options are for purchasing this item locally. I am trying to avoid going to Guad.

I would also appreciate any advice on quality, etc.

I usually purchase Bosche tanks. Be sure to get the proper size for the application. Plumb it as close to the source as possible, so you are not waiting 5 minutes to get hot water. Also be aware that most of them require a minimum amount of water pressure to activate. If the pressure falls below the minimum it will shut off until the pressure builds back up. My Bosche heaters require a minimum of 30 PSI so I have my pressure switch set for 30 min/50 max.

Most local suppliers can get Bosche......

Any number of local places including Ferreplomeria on the Carretera west Ajijic prior to Strom White movers, opposite side of road.

Do your homework before assuming they will work everywhere. I have never heard of a story of a regular HW heater not working but many stories of On Demand not.