Adding a new water heater

[Handy Joe]

Hi all,
I have a friend that bought a smaller water heater and wants to add it to his larger water heater. Is that gonna be a problem because one is shorter than the other?
The videos I watched on how to tie two together, shows an equal balance of piping and you can’t do that one shorter, right?

 

[WorthFlorida]

Have your friend return the WH and install a

Cash Acme 3/4 Inch Tank Booster Water Heater with Thermostatic Mixing Valve, Temperature Gauge, Braided Hose, Domestic and Commercial Application, PEX Pipe, PE-RT, CPVC, Copper, 24644​

An Amazon search, about $146. You set the water heater to 140 degrees and the mixing valve, factory set, discharges the water at a safe 120 degrees. It makes a 50gallon water heater equivalent to a 90 gallon heater.

 

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[Fitter30]

Multiple Water Heaters: Reverse Return Piping Method - Water Heaters Installed by Licensed Plumber

In the evolving world of water heating technology, the reverse return, or ‘first in, last out’, configuration has emerged as a superior method for dual water heater setups. This approach not only improves efficiency but also offers notable flexibility and reliability. This is not the only way to...

kcwaterheater.com

Reverse return or series.