Is there a Marathon-esque tankless water heater with a lifetime warranty?
Ahoy — The Rheem Marathon water heater has a lifetime warranty because it uses a polybutene tank as opposed to steel tanks that are destined to corrode and fail.
Question: Are there any tankless water heaters with lifetime warranties? Anything built to an equivalent standard of longevity as the Marathon?
Per Energy.gov, conventional water heaters with tanks last about 12 years, while tankless models last about 20 years. Let’s conservatively say that the Marathon is good for 40 years – I’m interested in knowing about any tankless models with that kind of lifespan.
I’ve attached a diagram of a tankless water heater – what is going to fail here? It’s the tanks that fail in conventional models, so what components in tankless models are limiting their lifespans to ≈ 20 years?
Thanks for your help…
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