"I thought I could manage replacing a hot water tank — I just didn't expect this."

A homeowner in the Pacific Northwest discovered that replacing a water heater by themselves can be more complicated than it seems.

After a leak made it necessary to swap out a 34-year-old tank, the homeowner encountered several obstacles and turned to Reddit's r/AskAPlumber community for guidance.

What the homeowner described

In the Reddit post, the homeowner said the old heater stood 59.5 inches tall, while the replacement measured 63 inches. The supply tubes, meanwhile, came out of the wall only slightly higher than the current tank.

The original poster explained that the point where the tubes exit the wall is just barely above the existing tank, meaning the new unit would need to be moved about 7 inches away from the wall to clear them, or else the plumbing would need to be redone.

The homeowner added, "Plumbing definitely isn't my thing, but I figured I could handle swapping out a hot water tank, I just wasn't anticipating this. So my question is, would there be an issue just shifting the tank a bit… or should the plumbing be redone?"

Most commenters warned against letting the tank press against the plumbing. One user wrote, "And some blocking on that wall. You could also pull the nipples and replace for shorter ones (especially on the hot side). Still need some blocking."

Another commenter suggested a simpler hardware solution, saying, "3/4 brass street 90's." A separate reply proposed that the easiest fix might be to "Get a short water heater."

Commenters also pointed out that local code requirements can affect the installation. Several responses mentioned earthquake strapping in the Pacific Northwest and Oregon, while another commenter compared that with Virginia, where flex lines were handled differently.

Some replies also offered smaller efficiency suggestions. One commenter noted that the setup already had "a heat trap on the cold supply line as a bonus" and recommended adding pipe insulation on the hot line.

Possible solutions

Before buying a replacement or booking installation, it helps to compare the new unit's height with the existing pipe exits, strapping, and wall spacing — not just the tank's capacity.

The main fixes discussed in the thread were physical ones, including using brass 90-degree fittings, shortening the nipples on the hot or cold side, and adding blocking so the wall supports the strapped tank instead of the plumbing behind it.

If those changes still do not solve the clearance issue, replacing the water heater with a shorter model was also mentioned as an option.

For homeowners replacing an aging tank, Cala offers another option to consider while comparing dimensions and connection points. Cala's customizable smart heat pump water heaters are designed to lower energy bills by heating water only when needed, and may appeal to buyers looking for a smarter replacement instead of a direct tank swap.

More to read

Water heater replacements often bring the same fit, venting, and plumbing problems that came up in this Reddit discussion.

• One DIY swap stalled when thicker new tanks forced unexpected demolition behind the heater.

• Another homeowner learned that tearing out walls may be unavoidable when old plumbing leaves no room.

• In North Carolina, a leaking attic water heater replacement raised new concerns about venting.