[MENTION=216]Petras[/MENTION]We switched to one about 6 years ago. Best thing ever. I wanna say ours is a Richmond. Easy enough to install by myself. Only complaint that we have is that if we kick on the fill spout for a tub too fast, the water temp sensor in the unit senses really cold water and goes into a fault state. Simply shut the water off, wait 5 seconds and the fault clears and then start again. It's only the tub fill spouts, nothing else does it. Easy enough to remember to just ease into it when starting that up. As for savings on gas or anything like that I can't remember. I know we save some money by not continually heating heating a hot water heater, but showers seem to have gotten a lot longer now knowing that we don't have to limit water usage so everyone can showere at night... I can literally run every faucet/shower in the house at the same time as long as I want and have a never ending supply of hot water.
@Maddog I want to say this one is equivelant to ours. This ones a newer model, probably more efficient, and doesn't require anything more than 2" vent pipes.
https://www.menards.com/main/plumbi...513694149.htm?tid=-7722440044018780993&ipos=1
I put in a new hot water heater in 2020 asked about them and the people I dealt with told me not to do it , they had them but told me I would not be happy
As previously discussed, I would also look closely at a high capacity power vent gas unit as well. They are super efficient, pretty cheap to run, and will meet your hot water needs as well. And cost less in initial cost with probably a bit longer life. Problem is they are really, really hard to come by right now. But an 80 gal will take care of even a big family, the 100 is almost never ending hot water.