Upgrading to a heat pump water heater can lower energy bills, which is why a North Carolina cabin owner living in a 750-square-foot temporary home while a house is being built is considering alternatives to a small electric tank that doesn't last through an entire shower.
Here's what to know
In a thread on r/homeowners, the poster said the cabin is meant to be used mainly for guests, but its small standard electric water heater "doesn't last an entire shower." They also said the crawlspace is about 3 feet 6 inches high.
"We really just want to be able to take a shower without running out of hot water."
Much of the discussion focused on the electrical burden of going tankless. One commenter said, "It requires a lot of electricity (likely more than a small cabin's circuit breaker panel can support)."
Incoming water temperature was another major factor. The poster said the cabin uses North Carolina well water that stays around 58 degrees Fahrenheit year-round, and commenters noted that colder supply water can make it harder for an electric tankless unit to deliver enough temperature rise in winter. They also said the cabin currently has 200-amp service, while the future house is expected to have its own panel even if both buildings end up on the same transformer.
More background
Climate came up repeatedly in the anecdotes. A Florida commenter with a small tankless in an 800-square-foot townhouse said it has worked well there, though the difference becomes more noticeable in winter.
Water quality also came up. After one commenter warned that hard water can be tough on tankless systems, the poster replied that they would "likely get a softener."
What can be done?
Before swapping in an electric tankless, commenters suggested other ways to stretch the existing setup. Ideas included adding a second storage tank for passive extra hot-water capacity, raising the tank temperature and using a mixing valve, and installing a water-saving showerhead.
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Cala makes customizable smart heat pump water heaters that can help homeowners lower energy bills by heating water only when needed. For a cabin that shifts from full-time use to occasional guest stays, targeted scheduling may be more appealing than keeping a standard tank hot all the time. Homeowners facing a similar choice may want to compare panel capacity, cold well-water temperature, and intermittent use patterns alongside smart heat pump options from Cala.
Where can I learn more?
For more on the trade-offs between electric tankless units and other ways to get a longer, hotter shower, these stories share real homeowner experiences.
• One homeowner got weak showers when toilets flush after switching to tankless.
• Many households still weigh the pros and cons of getting a tankless water heater before upgrading.
• For some buyers, how much they save with a tankless shapes the whole replacement decision.
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