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I would have to go outside and manually flip on the new heater it seems, which isn't a big deal.

So basically it's a parallel installation with 8 shutoff valves?

What would you recommend?

Thanks. When I Called all of the local plumbers, none of them worked on Bosch And they said they've never really even seen many of them. One plumber friend I know installed a tank that is filled by his tankless, but I'm not really sure how that works either. I'll look into that option

I made a post a few days ago regarding installing a second, backup tankless water heater but it seems like most people think it's not a good idea. I've called around 5:00 local plumbers, and all except one told me it was a waste of money to install a second heater. Currently, I have a Bosch...

So, I'm assuming it's not a very common thing to install to water heaters? It seems like many other people would want to have a backup plan in case one dies out. Couldn't I essentially just install them as two separate units with a bypass valve?

Cascade?

Thank you. So if I do install the second tankless, and don't have water running through it until I turn the valve, would it be safe to use? As for the Bosch, it's somewhere in the neighborhood of 15 to 18 years old and I have never once done maintenance on it including descaling. I called...

Test post

Currently using a 15-year-old Bosch aquastar tankless that I am sure is on its last leg. I plan on replacing the current tankless soon, but I would also like to install a second tankless, which I have already purchased. It's a Rinnai value model. I I've been reading a few forums, but I am...