I don't buy a warranty - I buy a water heater. And any GOOD product will outlast it's warranty. And any heater with 2 anodes will cost more than one with 1 or none - a brass valve will cost more than plastic
Will it still be working and not leaking 18 years from now??? Mine very likely will, and it's already 3 years old. Like I said before - I don't buy a warranty - I buy a quality water heater. The quality water heater just happens to also have a longer warranty.
And I didn't buy an "extra warranty"
You are free to buy the cheapest junk you can find. I prefer to buy quality.
"The bad taste of low quality lasts long after the sweet taste of low price has faded from the palate."
"It is almost always more expensive to pay too little for something than to pay too much"