--- product_id: 635472121 title: "Rheem 3.5kW 120V Point of Use Thermostatic Tankless Electric Water Heater" brand: "rheem" price: "14910835β‚«" currency: VND in_stock: true reviews_count: 13 category: "Rheem" url: https://www.desertcart.vn/products/635472121-rheem-3-5kw-120v-point-of-use-thermostatic-tankless-electric store_origin: VN region: Vietnam --- # 3.5kW power output 98% smaller footprint 1Β° increment thermostatic control Rheem 3.5kW 120V Point of Use Thermostatic Tankless Electric Water Heater **Brand:** rheem **Price:** 14910835β‚« **Availability:** βœ… In Stock ## Summary > πŸ”₯ Instant Hot Water, Zero Bulk β€” Upgrade Your Space & Lifestyle! ## Quick Answers - **What is this?** Rheem 3.5kW 120V Point of Use Thermostatic Tankless Electric Water Heater by rheem - **How much does it cost?** 14910835β‚« with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.vn](https://www.desertcart.vn/products/635472121-rheem-3-5kw-120v-point-of-use-thermostatic-tankless-electric) ## Best For - rheem enthusiasts ## Why This Product - Trusted rheem brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Tankless Freedom:** Eliminates wait time and wasted waterβ€”hot water on demand exactly where you need it - β€’ **Compact Powerhouse:** Delivers 3.5kW of instant hot water with minimal space usage - β€’ **Space-Saving Design:** Up to 98% smaller than traditional tanksβ€”ideal for tight spots like offices or wet bars - β€’ **Plug & Play Efficiency:** Hardwired 120V with 30-amp breaker ensures seamless integration and energy savings - β€’ **Precision Heat Control:** Thermostatic settings adjustable in 1-degree increments for perfect temperature every time ## Overview The Rheem 3.5kW 120V Point of Use Thermostatic Tankless Electric Water Heater is a compact, energy-efficient solution designed for low-flow applications. It features precise thermostatic control with 1-degree increments, requires a 30-amp double pole breaker, and boasts a footprint up to 98% smaller than standard water heaters. Perfect for residential or light commercial use, it delivers instant hot water on demand, saving space and reducing water waste. ## Description Rheem Professional 3.5kW thermostatic tankless electric water heater for residential and light commercial applications. Save water by eliminating the wait for hot water to reach the faucet. Install the heater directly at the point-of-use. Ideal for single, low-flow rate applications such as bathroom, wet bar, or garage sinks. See performance guide for average expectations in your region based onground water temperature and application flow rate. Review: Great product! - This works awesome for our needs - doesn't take all the space of a regular water heater. We turned it into a little storage closet! Review: If you know what you're getting, you'll love it! - There are many factors to consider before buying an electric tankless heater. By far the most important -- at least for me -- is whether the ground water temperature in your area is consistently warm enough to give the water heater a chance to succeed. I live in North Central Florida where the groundwater temperature is a rock-solid 72F (~22C) year-round. This is the ideal setup for tankless electrics; if you are far north this heater will likely fall short at the exact worst time, i.e. when it's winter and you could really use a nice, hot shower. I recommend looking closely at the map provided on Rheem's website and product pages to determine if this product is right for you. Second caveat, if you have a natural gas hookup, it is worth researching whether a gas-powered unit would be more efficient and/or less costly. There are considerations beyond this, of course, but those are the key ones that will determine whether you will be a happy camper or have cold water poured on those dreams of long, hot showers. If you're still considering after reading the above, then the short of it is (drumroll) ... I'm very satisfied and fully recommend making the jump to tankless! Here's the long-winded version: There is about 25- to 30-feet of pipe to travel between the water heater and the showerhead in my bathroom, and it takes about 25 seconds (well, 22.93 ... yes, I used a stopwatch) for the shower water to reach max temp. I did not use a stopwatch on my tank heater, but I'd guestimate it takes about 10 seconds longer for the tankless to deliver hot water than the tank unit it replaced. The main benefit, again, is that the tankless will continue to deliver hot water indefinitely while the tank is finite -- so, no more playing beat the clock and if you get in the water and realize you forgot your razor or something. The temperature coming out of the showerhead lines up with the temperature on the digital display for the main shower. There is a slight, but noticeable (I'd say 2F-4F/1C-2C) drop from the maximum temperature for the shower furthest away from the water heater. There is enough overhead that you can crank it a few degrees higher -- just be sure your shower handle can settle on something that won't scald you if you go above the recommended! I can also verify that the throughput on the model I bought (24 kW) is enough to handle two showers running at the same as well as start a load of laundry on hot -- I'm sure it could handle more, but there's not a scenario I can imagine where I would need it to. All in all, the flow is as good or better than the water heater it replaced. The dimensions listed on the product page are accurate. As far as your monthly bill, this hasn't made a significant impact although it may in the future. Here's some data from my most recent utility bill compared to the same month last year. Keep in mind the following figures are the daily averages listed on my bill for the whole home, not just the heater, although it is the only major appliance we have replaced over the past 12 months. April 2025 = 33.90 kWh electric and 0.06 KGA water (whole-home daily average) April 2024 = 31.34 kWh electric and 0.03 KGA water (whole-home daily average) Based on the above info (and the prior two months), it's essentially a wash -- we're using more power but only because we're taking longer showers because we can actually enjoy the heat now rather than worrying whether we're leaving enough water for everyone else! I'm sure that our water usage will level out once the novelty wears off, but that might be a while :) Now for the elephant in the room: Installation. If you can't say right now, with confidence and without any further research, whether you could get away with a DIY install, I'll answer the question for you: No, you can't. The plumbing end of the equation is easy -- the only hard part was ditching the tank unit. Beyond that, all you will need is a few fittings and a little pipe to hook it all up, plus the proper hardware to secure it to the wall. Any homeowner who would be comfortable ripping out a vanity sink/faucet and installing a new one should be able to do this portion themselves. The electrical hookup is another story. First, you will need 200-amp service to make this viable; if you don't, save yourself the headache. Second, depending on the distance between your electrical box and your water heater, you may need to have an auxiliary breaker box installed, as we did. Just as water temperatures vary regionally, so do electrician's rates. In our area we paid $850 to have a licensed electrician and his journeyman knock it out -- it took them about three hours and that includes the cost of the pictured auxiliary box. I would expect that rate to be higher in major metros but hopefully it gives a ballpark for what you can expect to pay beyond the sticker price. ## Features - ELECTRICAL REQUIREMENTS: 1 x 30 AMP Double Pole Breaker Required. Product installation hard wired to 120 volts requiring a 30-amp breaker. - SAVES SPACE: Ideal for low flow point-of-use applications, such as in a bathroom, office breakroom, wet bar, or garage. The compact size of the water heater is up to 98% smaller than a standard electric water heater. - EASILY ADJUSTABLE: Thermostatic temperature controls in 1-degree increments ranging from 80 to 140 degrees Fahrenheit for on-demand, consistent hot water. - INSTALLATION: Designed to be mounted in an upright position with the inlet and outlet water connections at the bottom of the unit for ease of installation with no venting required. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0CJJY7RZZ | | Best Sellers Rank | #9,136 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #2 in Water Heaters | | Brand | Rheem | | Brand Name | Rheem | | Capacity | 0.9 Gallons | | Color | Gray | | Customer Reviews | 4.2 out of 5 stars 4,006 Reviews | | Efficiency | Highly Efficient | | Flow Rate | 0.9 Gallons Per Minute | | Heat Output | 105 Degrees Fahrenheit | | Included Components | RTEX-04T Tankless Electric Water Heater | | Is Electric | Yes | | Item Depth | 3 | | Item Dimensions W x H | 10.88"W x 5.88"H | | Item Type Name | Tankless Water Heater | | Item Weight | 4 Pounds | | Manufacturer | Rheem | | Manufacturer Part Number | RTEX-04T | | Material Type | Stainless Steel | | Maximum Pressure | 150 Pound per Square Inch | | Maximum Temperature | 140 Degrees Fahrenheit | | Model Number | RTEX-04T | | Mount Type | Wall | | Power Source | ac_dc | | Product Dimensions | 10.88"W x 5.88"H | | Special Feature | [IN] Space-saving Design, Energy-saving | | Special Features | [IN] Space-saving Design, Energy-saving | | Style Name | Point-of-Use, 3.5 kw | | UPC | 020352758008 | | Voltage | 120 Volts | | Wattage | 3500 watts | ## Product Details - **Brand:** Rheem - **Capacity:** 0.9 Gallons - **Power Source:** ac_dc - **Product Dimensions:** 10.88"W x 5.88"H - **Special Feature:** [IN] Space-saving Design, Energy-saving ## Images ![Rheem 3.5kW 120V Point of Use Thermostatic Tankless Electric Water Heater - Image 1](https://m.media-amazon.com/images/I/71UTZnaKzgL.jpg) ![Rheem 3.5kW 120V Point of Use Thermostatic Tankless Electric Water Heater - Image 2](https://m.media-amazon.com/images/I/51szlPUeqKL.jpg) ![Rheem 3.5kW 120V Point of Use Thermostatic Tankless Electric Water Heater - Image 3](https://m.media-amazon.com/images/I/71L3UaIAJpL.jpg) ![Rheem 3.5kW 120V Point of Use Thermostatic Tankless Electric Water Heater - Image 4](https://m.media-amazon.com/images/I/71IEerQNsEL.jpg) ![Rheem 3.5kW 120V Point of Use Thermostatic Tankless Electric Water Heater - Image 5](https://m.media-amazon.com/images/I/41pmIzQx5+L.jpg) ## Available Options This product comes in different **Style** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Great product! *by L***K on May 26, 2026* This works awesome for our needs - doesn't take all the space of a regular water heater. We turned it into a little storage closet! ### ⭐⭐⭐⭐⭐ If you know what you're getting, you'll love it! *by 2***W on May 27, 2025* There are many factors to consider before buying an electric tankless heater. By far the most important -- at least for me -- is whether the ground water temperature in your area is consistently warm enough to give the water heater a chance to succeed. I live in North Central Florida where the groundwater temperature is a rock-solid 72F (~22C) year-round. This is the ideal setup for tankless electrics; if you are far north this heater will likely fall short at the exact worst time, i.e. when it's winter and you could really use a nice, hot shower. I recommend looking closely at the map provided on Rheem's website and product pages to determine if this product is right for you. Second caveat, if you have a natural gas hookup, it is worth researching whether a gas-powered unit would be more efficient and/or less costly. There are considerations beyond this, of course, but those are the key ones that will determine whether you will be a happy camper or have cold water poured on those dreams of long, hot showers. If you're still considering after reading the above, then the short of it is (drumroll) ... I'm very satisfied and fully recommend making the jump to tankless! Here's the long-winded version: There is about 25- to 30-feet of pipe to travel between the water heater and the showerhead in my bathroom, and it takes about 25 seconds (well, 22.93 ... yes, I used a stopwatch) for the shower water to reach max temp. I did not use a stopwatch on my tank heater, but I'd guestimate it takes about 10 seconds longer for the tankless to deliver hot water than the tank unit it replaced. The main benefit, again, is that the tankless will continue to deliver hot water indefinitely while the tank is finite -- so, no more playing beat the clock and if you get in the water and realize you forgot your razor or something. The temperature coming out of the showerhead lines up with the temperature on the digital display for the main shower. There is a slight, but noticeable (I'd say 2F-4F/1C-2C) drop from the maximum temperature for the shower furthest away from the water heater. There is enough overhead that you can crank it a few degrees higher -- just be sure your shower handle can settle on something that won't scald you if you go above the recommended! I can also verify that the throughput on the model I bought (24 kW) is enough to handle two showers running at the same as well as start a load of laundry on hot -- I'm sure it could handle more, but there's not a scenario I can imagine where I would need it to. All in all, the flow is as good or better than the water heater it replaced. The dimensions listed on the product page are accurate. As far as your monthly bill, this hasn't made a significant impact although it may in the future. Here's some data from my most recent utility bill compared to the same month last year. Keep in mind the following figures are the daily averages listed on my bill for the whole home, not just the heater, although it is the only major appliance we have replaced over the past 12 months. April 2025 = 33.90 kWh electric and 0.06 KGA water (whole-home daily average) April 2024 = 31.34 kWh electric and 0.03 KGA water (whole-home daily average) Based on the above info (and the prior two months), it's essentially a wash -- we're using more power but only because we're taking longer showers because we can actually enjoy the heat now rather than worrying whether we're leaving enough water for everyone else! I'm sure that our water usage will level out once the novelty wears off, but that might be a while :) Now for the elephant in the room: Installation. If you can't say right now, with confidence and without any further research, whether you could get away with a DIY install, I'll answer the question for you: No, you can't. The plumbing end of the equation is easy -- the only hard part was ditching the tank unit. Beyond that, all you will need is a few fittings and a little pipe to hook it all up, plus the proper hardware to secure it to the wall. Any homeowner who would be comfortable ripping out a vanity sink/faucet and installing a new one should be able to do this portion themselves. The electrical hookup is another story. First, you will need 200-amp service to make this viable; if you don't, save yourself the headache. Second, depending on the distance between your electrical box and your water heater, you may need to have an auxiliary breaker box installed, as we did. Just as water temperatures vary regionally, so do electrician's rates. In our area we paid $850 to have a licensed electrician and his journeyman knock it out -- it took them about three hours and that includes the cost of the pictured auxiliary box. I would expect that rate to be higher in major metros but hopefully it gives a ballpark for what you can expect to pay beyond the sticker price. ### ⭐⭐⭐⭐⭐ Tankless water heater *by P***O on May 3, 2026* Great system, easy to install. Was a 1/2 day project but over all I'm very pleased on the outcome. The temperature is very easy to set and instant hot on demand was a plus. I did have to add a sub panel ## Frequently Bought Together - Rheem 3.5kW 120V Point of Use Thermostatic Tankless Electric Water Heater - HYDRO MASTER Tankless Water Heater Service Valve Kit with Pressure Relief Valve 3/4-Inch IPS Isolator Clean Brass - Rheem 6.5kW 240V Point of Use Thermostatic Tankless Electric Water Heater --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.vn/products/635472121-rheem-3-5kw-120v-point-of-use-thermostatic-tankless-electric](https://www.desertcart.vn/products/635472121-rheem-3-5kw-120v-point-of-use-thermostatic-tankless-electric) --- *Product available on Desertcart Vietnam* *Store origin: VN* *Last updated: 2026-06-04*