We’ve been putting the Atmor ThermoPro 24kW Tankless Water Heater through its paces lately. After dealing with the limitations of a traditional tank, we wanted to see if this $250 unit could actually handle the demands of a full house.
Here is our honest review of the performance, the “shower test,” and what you need to know about the transition to tankless.
The “Shower Test”: Endless Hot Water?
The biggest change from a traditional tank is the capacity. With a tank, once you hit that 30-minute mark or the second person finishes their shower, you know the “cold is coming,” and you’re stuck waiting an hour for a refill.
- The Result: With the Atmor ThermoPro, both our sons can take full showers, and Danielle still has all the hot water she needs for hers.
- The “Lag” Factor: If you have three people running hot water at once (e.g., two showers and the dishwasher), the temperature will dip for a second. The system has to “dump more amps” to meet the higher flow rate. After a brief adjustment period, it kicks back up to temperature and holds steady.
The Technical Specs: Florida Performance
Water temperature performance is heavily dependent on your “groundwater inlet temperature.”
- Inlet Temp: Here in Florida, our water coming in is around 65°F.
- Flow Rate: At this inlet temp, this 24kW unit should provide between 4.6 and 5.0 Gallons Per Minute (GPM) at 140°F.
- Our Settings: We usually keep ours set around 105°F to 117°F. In our testing, even when set to 117°F, we saw the digital output reaching nearly 125°F at the tap.
The Pros and Cons
The Pros:
- Price: At roughly $250, it is a very affordable whole-home solution.
- Space: It takes up zero floor space compared to a massive 50-gallon tank.
- Efficiency: You aren’t paying to keep 50 gallons of water hot 24/7.
The Cons:
- Initial Warm-up: It takes a few seconds longer for the hot water to reach the tap compared to a tank because the heating elements have to energize and reach temperature from a dead stop.
- Amperage Draw: As we’ve discussed before, you need the electrical infrastructure to support those 24kW spikes.
Final Verdict
If you have the electrical capacity to handle it, the Atmor ThermoPro 24kW is a solid, budget-friendly way to move your home into a tankless setup. No more racing to the shower or worrying about the dishwasher “stealing” your hot water.
Watch our full performance review and temperature test here: Atmor ThermoPro Review
If you’re interested in the actual installation process or a breakdown of all the parts we used for this build, check out our previous videos in this series.
After all that testing, we’re usually ready for some of Danielle’s home cooking. She’s the reason I’m “half the man I was yesterday” (in a good way!). Head over to dininginwithdanielle.com for recipes that are as efficient as this water heater.
Y’all please take care.
Install Video: https://youtu.be/MQbIawTcXoo
Budget Video: https://youtu.be/nxe0XEX6hKw
Blog Post:
https://www.chrisdoeswhat.com/category/diy/tankless_water_heater/
All the part and were we got them, hope this helps you if you want to upgrade, or you need a new water heater like we did.
Atmor AT-910-24TP AT-D24TP-AZ ThermoPro 24 kW / 240V 4.6 GPM Digital Thermostatic Tankless Electric Instant Water Heater, 24kW/240V, Gray
$256.26 we paid $193.86
Link for this product: https://amzn.to/2AXDKQG
Southwire 63949221 25′ 8/3 with ground Romex brand SIMpull residential indoor electrical wire type NM-B, Black
$54.47
Link for this product: https://amzn.to/2RMOdsR
Tankless Water Heater Flush Kit 3/4″Lead-Free Isolation Service Valves 3/4-Inch Temperature Pressure Relief Valve for Hot Water Heaters Single Handle Full Port IPS Isolator Brass NSF-61
$44.99
Link for this product: https://amzn.to/2sDUOXm
HomeDepot we spent $156 on these parts:
3 40 amp Breakers $66
2 24 inch flex hoses $22
Rest of HomeDepot cost:
10-foot CPVC
10-foot Conduit
Concrete Screws
Brackets for pipe
Inserts for Breaker box