Water & Temperature Detector Market Value
Analysis of 1,807 eBay listings for water and temperature detectors.
What you'll usually pay
💡 Used ones cost about 19% more here.
👉 In short easy summary
The best value is found in White models and Powerline/UPB protocols, which are 17% and 53% below the market median respectively. High-end pricing is driven by Blue models and Thread protocol devices, both seeing increases over 100%.
💚 Best value for your money
Price by power source
Why? Prices range from 39.99 for battery units to 81.87 for USB models.
Price by smart home protocol
Why? Value varies significantly by connectivity, from 17.99 for Powerline/UPB to 78.99 for Thread.
🛒 Some on sale right now
Common questions
What is the typical cost for a new detector?
The median price for new units is 37.
Which smart home protocol is the most affordable?
Powerline/UPB is the cheapest option with a median of 17.99.
How does Wi-Fi connectivity affect the price?
Wi-Fi detectors have a median price of 42.94, which is 13% above the market median.
How we got these numbers
Worked out from 200 live eBay listings (price range $16–$125, odd outliers ignored). These are asking prices, so use them as a guide. Last checked July 26, 2026.