EcoSmart ECO 11 is a small, smart heater that fits tight budgets.
Picture this. You turn on the shower and wait. And wait. The water never gets hot enough, or it runs cold in the middle. Your power bill keeps creeping up. A compact tankless heater can fix that. In many homes, the EcoSmart ECO 11 is the first upgrade that feels like a breath of fresh air. It saves space, cuts standby loss, and uses only the power you need. In this deep dive, I share what I found in ecosmart electric tankless water heater eco 11 reviews, plus how it stacks up against EcoSmart ECO 8, ECO 18, ECO 27, and a close rival from Rheem.
EcoSmart ECO 11, 13 kW, 240V Tankless
The EcoSmart ECO 11 is a 13 kW, 240V electric tankless unit. It shines in small homes, condos, and in-law suites. It heats water on demand and uses self-modulating tech to match power draw to flow. That means fewer spikes, more comfort, and less waste.
In warm climates, it can support a shower and a sink at the same time. In cooler climates, it fits one low-flow shower or a sink. The digital dial lets you set temperature in small steps. Most ecosmart electric tankless water heater eco 11 reviews praise its steady output and tiny footprint.
Pros:
- Self-modulating control saves power during low-flow use
- Compact size frees up closet or under-sink space
- Simple digital temperature control in 1-degree steps
- Good for small homes, studios, or guest suites
- Lower upfront cost than larger whole-home units
Cons:
- Not ideal for large homes or cold groundwater
- Needs a dedicated circuit and proper wire size
- Flow drops if you open many taps at once
My Recommendation
If you live in a warm region or a small space, start here. The ECO 11 gives steady hot water for one bathroom, plus a sink, with good flow in many homes. I read many ecosmart electric tankless water heater eco 11 reviews and saw a clear theme. Owners love the size, the price, and the quiet run. But they also warn not to push it with many showers at once.
Choose it if you want an easy, budget step into tankless. It is also great for cabins and rental ADUs where space is tight. Have a pro check your panel and breaker size. That step keeps you safe and keeps the warranty in good shape.
| Best for | Why |
|---|---|
| Small homes or studios | Right-sized output for one bath in warm areas |
| Budget tankless upgrade | Lower cost and high efficiency with self-modulation |
| Secondary or point-of-use | Compact design fits near the sink or shower |
EcoSmart ECO 8 Electric Tankless, 8 kW
The ECO 8 is a step down in power from the ECO 11. It suits point-of-use and warm climate sinks. It can feed one low-flow shower in the right setup. It also makes sense for shops, garages, or a wet bar.
It uses the same self-modulating brain as larger EcoSmart units. That helps keep power use in check. The small frame mounts near the fixture and shortens pipe runs. Less pipe means less heat loss and a faster warm-up at the tap.
Pros:
- Very small size for tight spots and cabinets
- Great for a single sink or a light-use shower
- Fast install when placed near the tap
- Lower amp draw than bigger models
- Budget-friendly entry to tankless
Cons:
- Too small for whole-home use
- Limited flow in cool climates
- Not ideal for rain showers or spa heads
My Recommendation
Use the ECO 8 as a point-of-use booster. It fixes long waits for hot water at a far sink. It is also a match for tiny homes in warm areas. When I compare ecosmart electric tankless water heater eco 11 reviews to real-world ECO 8 feedback, the pattern is clear. The ECO 11 is the safe one-bath pick. The ECO 8 is for sinks or light showers only.
Pick it if your panel cannot handle a bigger breaker. Place it close to the tap for best results. You will like the speed and the cost control in a small space.
| Best for | Why |
|---|---|
| Point-of-use sinks | Short pipe runs, quick hot water |
| Tiny homes in warm areas | Low power need and small body |
| Shops and garages | Simple install, basic hot water on demand |
EcoSmart ECO 18, 18 kW, 240V Tankless
The ECO 18 steps up to 18 kW. It covers one to two baths in warm climates. It also gives more headroom in places with cooler supply water. If you want more margin than the ECO 11, this is your size.
It uses the same 1-degree digital control and self-modulating logic. Many owners report a smoother shower when someone starts a load of laundry. It keeps pace better than small units. In ecosmart electric tankless water heater eco 11 reviews, people who needed more flow often moved up to the ECO 18 and were glad they did.
Pros:
- Strong flow for small to mid homes in warm areas
- Handles one shower plus a second tap well
- Stable temp thanks to smart power control
- Same compact footprint as other EcoSmart units
- Good value versus larger whole-home models
Cons:
- Needs more breakers and higher amp capacity
- Not ideal for big, cold-climate homes
- May require wiring upgrades in older panels
My Recommendation
Choose the ECO 18 if you have two baths and live in a mild to warm area. It gives you breathing room that the ECO 11 cannot. I often see ecosmart electric tankless water heater eco 11 reviews that mention peak-time dips. The ECO 18 trims those dips by adding power where it helps most.
Ask an electrician to confirm breaker size and wire gauge first. If your daily use is one to two showers with light overlap, you will like the ECO 18. It balances price, power, and space very well.
| Best for | Why |
|---|---|
| Two-bath homes in warm zones | Enough flow for daily overlap |
| Upgraders needing headroom | More power than ECO 11 without a big jump in cost |
| Families with varied schedules | Stays steady when other taps open |
EcoSmart ECO 27 Electric Tankless, 27 kW
The ECO 27 is a whole-home workhorse in warm climates. It has the power to feed multiple showers and taps at once. It also helps in mixed climates with cold winters and mild summers. If you need true home-wide hot water, start your math here.
It still uses EcoSmart’s self-modulating core. That saves power when you run just a sink at night. But it has the headroom to keep showers hot when a dishwasher kicks on. In ecosmart electric tankless water heater eco 11 reviews, many who outgrew the ECO 11 found peace with the ECO 27.
Pros:
- High output for whole-home coverage in many areas
- Runs two to three showers in warm regions
- Smart temp control with fine tuning
- Durable design with replaceable elements
- Energy savings versus large storage tanks
Cons:
- Higher install cost due to multiple breakers
- May need panel upgrades in older homes
- Overkill for small apartments
My Recommendation
The ECO 27 is for households that want one unit to rule it all. Pick it if you live in a warm to moderate climate and have two or more baths. It shines with families who use water at the same time. While I love the value I see in ecosmart electric tankless water heater eco 11 reviews, a large home will be happier with the ECO 27.
Do a load check with a licensed electrician. Verify available amps and breaker spaces. If you pass that test, the ECO 27 gives hotel-like hot water at home with smart power use.
| Best for | Why |
|---|---|
| Whole-home in warm climates | High flow with steady temperature control |
| Families with peak-time overlap | Keeps showers hot with other loads running |
| Upgrades from small tank heaters | Space saving and energy efficient |
Rheem 11 kW, 240V Electric Tankless
This Rheem unit competes with the ECO 11 on power and price. It is an 11 kW, 240V tankless heater with simple digital control. It often uses copper immersion elements for solid heat transfer. It is a trusted brand with a long track record in water heaters.
It fits small homes, ADUs, or a single bath. I like its easy-to-read display and compact case. Some users say the flow sensor is very sensitive. That can help fine-tune temp under low-flow use.
Pros:
- Reputable brand with wide service network
- Good fit for one-bath setups
- Simple, clear digital control
- Compact, clean look for wall installs
- Competitive pricing in this power range
Cons:
- Lower power than 13 kW units like the ECO 11
- Flow can drop in cold climates
- May need descaling in hard water areas
My Recommendation
Pick the Rheem 11 kW if brand support and wide parts access matter most to you. For warm zones and a single bath, it holds its own. If you need a bit more headroom, the ECO 11’s 13 kW rating may be safer. I have read many ecosmart electric tankless water heater eco 11 reviews that highlight this margin.
Match the unit to your inlet water temps and flow needs. If your panel is tight, this Rheem can be easier to fit. Keep a descaling plan if your water is hard.
| Best for | Why |
|---|---|
| Single-bath in warm areas | Right-sized output and simple controls |
| Brand-focused buyers | Strong service network and support |
| Panels with limited capacity | Lower amp draw vs higher kW models |
FAQs Of ecosmart electric tankless water heater eco 11 reviews
How much hot water can the ECO 11 make?
It supports about one shower and a sink in warm climates. In cooler areas, plan for one low-flow shower or a sink at a time.
What electrical setup does the ECO 11 need?
It needs 240V power, a dedicated breaker, and the right wire size. Have a licensed electrician confirm your panel can handle it.
Will the ECO 11 work in cold climates?
Yes, but with lower flow. Use a low-flow showerhead and avoid running many taps at once.
Do I need a water softener?
If you have hard water, descaling helps. A softener or a filter system will extend element life and keep output steady.
Is there a warranty on the ECO 11?
EcoSmart offers a strong residential warranty when installed by a pro and registered. Check current terms for coverage details.
Final Verdict: Which Should You Buy?
If you live small or in a warm zone, the ECO 11 is a winner. It is the sweet spot for cost, comfort, and space. Many ecosmart electric tankless water heater eco 11 reviews echo that view.
Need more? Pick ECO 18 for margin or ECO 27 for whole-home flow. For point-of-use, go ECO 8. If brand service is key, consider the Rheem 11 kW.
