New water heater is too tall. Questions about routing piping. : r/Plumbing

How screwed am I? (Trying to install new water heater - details in comments) : r/Plumbing

I replaced the old water heater and the new one is about 4” taller and now my dumbass has a ventilation issue. Any suggestions please. : r /HomeMaintenance

Is it easy to install 4 taller water heater here? : r/Plumbing

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Tankless Water Heater 5.5kw 240V, ECOTOUCH Point-of-Use Digital Display,Electric Instant Hot Water Heater with Self-modulating,Overheating Protection,White