Buying a house can sometimes mean inheriting someone else's plumbing shortcuts.
That's what one homeowner learned after a plumber noticed a questionable detail on a tankless water heater during an unrelated visit.
Here's what to know
The concern raised in the Reddit post was the vent connection material. The homeowner said a plumber told them the unit's intake and exhaust were connected with flexible Fernco couplings in places where PVC should've been used.
"Wanted to confirm that everything else was installed correctly before I start working on the WH," they said.
A follow-up photo helped address the main issue commenters focused on: condensate drainage, which is easy to overlook on high-efficiency equipment.
"Is there a drain line for the condensate discharge?" one user asked. "That's the only thing I notice."
"Is this what you are referring to?" the homeowner replied. "Both the pressure relief and condensate drain into the drip pan."
A separate commenter saw flaws in the work without considering it a major failure, saying the install had "some nit picky things."
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"It's fine. Just not the most professional looking install," they added.
More background
Even when a tankless unit is operating efficiently, venting and condensate handling still matter.
One commenter also warned about brass fittings paired with crimped PEX, writing that they "corrode and leak from the acidic condensate."
Even when a unit appears to be running normally, small shortcuts can turn into bigger repair bills later. A venting fix, a revised drain line, or a materials upgrade is often far less expensive than dealing with water damage, corrosion, or a full replacement after a hidden issue gets worse.
What can be done?
The smartest next step is usually a model-specific inspection by a licensed plumber or HVAC professional. Photos from a previous owner or a quick look can be helpful, but they're no substitute for checking vent materials, clearances, drain routing, and whether the setup aligns with local code.
For some households, it may be worth exploring replacement options such as Cala rather than continually fixing an aging setup. Modern heat pump water heaters, such as those from Cala, offer customizable controls that schedule water heating precisely when needed to reduce energy costs. This efficiency makes upgrading an attractive alternative for those looking to avoid constant troubleshooting.
Where can I learn more?
Since this issue centers on a tankless system that may not have been installed properly, it helps to step back and look at the bigger picture. The articles here cover routine water heater upkeep, why many homeowners choose tankless systems, and the longer-term savings that can shape a repair-or-replace decision.
• Simple water heater maintenance tips can help homeowners avoid leaks and surprise repair bills.
• For many households, switching to a tankless model can lower energy use and monthly costs.
• HGTV host Jenny Marrs showed how a tankless swap can free space and trim bills.
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