The short version: KTNNKG is one of the many short-name, marketplace-only brands that sell rebranded Tuya-ecosystem hardware on Amazon. Its broader catalog is mostly wireless remote-control switches and relays, with a Wi-Fi thermostat as one line among several unrelated electronics products. We found no independent professional reviews, Reddit discussion, or verified owner feedback specific to this thermostat — this is a spec-based review only.

Who It’s For

Buyers who want the cheapest possible Wi-Fi thermostat for electric or floor heating and are comfortable with a brand that has no retail presence, no dedicated support site, and essentially no independent track record. It’s a fit for a low-stakes secondary zone, not a primary living space you’re counting on.

It’s not a fit if you want any confidence in long-term firmware support, warranty enforcement, or rebate eligibility.

Setup & Compatibility

  • C-wire: Requirements vary by listing — confirm the wiring diagram against your system before ordering.
  • System compatibility: Marketed for electric heating and floor/underfloor systems. Because brands like this frequently source hardware from the same handful of Tuya OEM factories, the actual unit you receive may closely resemble other similarly priced thermostats sold under different names.
  • App setup: Pairs through the Tuya/Smart Life app over 2.4GHz Wi-Fi, then links to Alexa or Google Assistant separately.

App & Ecosystem

Scheduling, remote control, and Alexa/Google Assistant voice control are the standard feature set for this category. No confirmed HomeKit or Matter support. There’s no dedicated KTNNKG app beyond the shared Tuya infrastructure.

Price & Value

KTNNKG Smart Wi-Fi Thermostat
Price (USD) ~$20–45
Where sold Amazon.com (third-party sellers)
Warranty Varies by seller — check the listing before buying
Subscription required No

No confirmed ENERGY STAR certification, so don’t count on rebate eligibility — see Smart Thermostat Rebate by State.

Pros & Cons

Pros:
– Very low price
– Basic scheduling and voice control work as advertised on the spec sheet
– Simple Tuya-app pairing process shared with many similar products

Cons:
– No independent reviews or verified owner feedback found for this brand’s thermostat
– No dedicated support site or retail presence to fall back on for warranty issues
– No confirmed ENERGY STAR certification
– Marketplace listings for this category change sellers and specs without notice

The Recommendation

Buy the KTNNKG Smart Wi-Fi Thermostat only if price is the deciding factor and you’re comfortable with essentially zero independent information about how it performs long-term. For a similar price with more accountability, an Amazon Smart Thermostat or Wyze Thermostat is the safer bet.

A note on sourcing: No professional reviews or meaningful owner feedback were found for this brand’s thermostat. This review is based on manufacturer specifications and how this category of product typically performs.

Frequently Asked Questions

Is KTNNKG a reliable brand?
There’s no meaningful independent review history to confirm reliability one way or the other. Treat this as a low-information purchase.

Does the KTNNKG thermostat need a C-wire?
Check the specific listing — requirements vary. Confirm against your system’s wiring before ordering.

Is the KTNNKG thermostat ENERGY STAR certified?
No confirmed certification was found, so it’s unlikely to qualify for utility rebates.