Top 10 Best Instantaneous Water Heaters in 2021

Have you also tried using over-priced water heaters that take forever to heat the water and does not deliver a good amount of warm/ hot water?

There are way too many useless water heaters out there, so we have taken on ourselves to find the 10 absolute best reviewed water heaters.

Check the top 10 instantaneous water heaters out below, so you can make sure you buy a heater in reasonable price, that heats the water quickly and also supplies a lot of hot water!

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Having checked thousands of instantaneous water heater reviews, we can say that the Stiebel Eltron is the best choice for most people.

94% of the reviewers give 4+ stars to the Stiebel Eltron instantaneous water heater!


STIEBEL ELTRON instant electric hot water heater

Stiebel Eltron

The best reviewed instantaneous water heater
Rated 4.7 out of 5

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PS: We have checked 2,034 reviews to make this top 10 list!

Rank Model Rating
1 STIEBEL ELTRON instant electric hot water heater Stiebel Eltron 4.7 Check Price
2 Stiebel Eltron Durchlauferhitzer DHB Weighted Electronically Controlled St, White, (DHB 18 ST) 227608 18 kilowatts, 400 voltsV Stiebel Eltron 4.6 Check Price
3 Stiebel DCE 11/13 Compact Instantaneous Water Heater stiebel 4.6 Check Price
4 Camplux BW422 16L Tankless Propane Gas Hot Water Heater Portable Instant Camping Gas Shower Outdoor Camplux 4.6 Check Price
5 Stiebel Eltron DHC-E8/10 Electronic Instantaneous Water Heater Stiebel Eltron Gmbh 4.6 Check Price
6 ATC Water Heaters (5 Litre) ATC 4.4 Check Price
7 Samger Samger 12L Tankless Water Heater Digital Display 3.2GPM LPG Instant Water Boiler Stainless Steel Liquefied Petroleum Gas Hot Water Burner Samger Samger 4.4 Check Price
8 Hyco Water Heater SF05K 2.0kW 5L Hyco 4.3 Check Price
9 Camplux BW158BC 6L Instant Gas Water Heater with Rain Cap, CE Certified GAR Standard Tankless Propane Gas Boiler, Use for Outdoor Shower Camping RV Trip Horse Washing CAMPLUX 4.2 Check Price
10 FVSTR-Swime 8L Propane Gas Lpg 2GPM Instant Hot Water Heater Tankless Boiler CE w/Shower FVSTR 4.1 Check Price
How we rate the instantaneous water heaters

We have checked 2,034 instantaneous water heater reviews, so we can show you the weighted average rating of all the instantaneous water heaters.

Using the average ratings, you can check what all the reviewers think instead of just viewing the subjective opinion of one specific reviewer.

It's much simplier to find the best products that way.

Not sure what instantaneous water heater to choose? Read on as we are going to take a closer look at each instantaneous water heater!


1 – Stiebel Eltron

5 review starsRating 4.7 based on 101 reviews

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STIEBEL ELTRON instant electric hot water heater

Here’s what the reviewers think about the Stiebel Eltron:

Reviewers like these things about the Stiebel Eltron

  • Several customers like that the item is worth the money.
  • A couple of users are happy with the fast delivery.
  • Many reviewers laud its excellent price performance ratio.
  • Several buyers admire its solid built.
  • Some customers said that the device is easy to assemble.
  • Others are happy as it provides with large supply of hot water sufficient for their needs.
  • Few reviewers like that the item is well packed.
  • Some pointed out that the device meets the expectations well.
  • One customer pointed out that it supplies evenly warm/ hot water.

Reviewers don’t like these things

  • One customer complained that the display is without the background lighting.
  • Other complained about the defective device.

  • Rating 4.7 based on 101 reviews
  • 94% of the reviewers give 4+ stars to this instantaneous water heater


2 – Stiebel Eltron

4.5 review starsRating 4.6 based on 1,401 reviews

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Stiebel Eltron Durchlauferhitzer DHB Weighted Electronically Controlled St, White, (DHB 18 ST) 227608 18 kilowatts, 400 voltsV

Here’s what the reviewers think about the Stiebel Eltron:

Reviewers like these things about the Stiebel Eltron

  • Several customers laud the German workmanship.
  • A couple of buyers are happy with the packaging of item.
  • Others laud the easy installation of device.
  • Several buyers find the 3-stage temperature setting practical.
  • Some customers like that it comes with all the parts required for its assembly.
  • Others are happy with the clear instructions.
  • Few buyers are pleased with the quick delivery.
  • Many users said that the device functions well.
  • More than a few customers admire the price performance ratio.
  • Some users laud its slim design as it fits nicely in a small space.
  • Several customers pointed out that it instantaneously heats the water.
  • Few buyers are happy as it regulates temperature very well.

Reviewers don’t like these things

  • Very few customers mentioned that it is not appropriate for domestic use.
  • Several users complained that device is not long lasting.
  • Some reviewers find the installation tricky.

  • Rating 4.6 based on 1401 reviews
  • 92% of the reviewers give 4+ stars to this instantaneous water heater


3 – stiebel

4.5 review starsRating 4.6 based on 163 reviews

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Stiebel DCE 11/13 Compact Instantaneous Water Heater

Here’s what the reviewers think about the stiebel:

Reviewers like these things about the stiebel

  • A lot of customers laud its compact size.
  • Some pointed out that the temperature setting works well.
  • Many buyers are pleased with its easy installation.
  • Others like that the item is robust.
  • Several reviewers said that the water heater provides with sufficient hot water.
  • Some buyers laud the clear instruction manual.
  • Others are pleased with the drill template included in the package.
  • Few reviewers said that the item is inexpensive.
  • Very few buyers are pleased with the fast delivery.
  • Many users said that it serves its purpose well.
  • Some customers find the flow rate adequate for dishwashing.
  • Others admire its fast temperature regulating action.

Reviewers don’t like these things

  • One customer complained that the water does not gets warm enough.
  • Other is disappointed as the device does not have any display.
  • Few buyers are displeased on receiving faulty item.

  • Rating 4.6 based on 163 reviews
  • 92% of the reviewers give 4+ stars to this instantaneous water heater


4 – Camplux

4.5 review starsRating 4.6 based on 50 reviews

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Camplux BW422 16L Tankless Propane Gas Hot Water Heater Portable Instant Camping Gas Shower Outdoor

Here’s what the reviewers think about the Camplux:

Reviewers like these things about the Camplux

  • Several customers are impressed with its robustness.
  • Some buyers laud the item for its easy installation.
  • Many customers like that it can provide large amount of hot water.
  • Several customers are pleased with the price performance ratio.
  • Few buyers are happy with the fast shipment.
  • More than few users said that the device runs flawlessly.

Reviewers don’t like these things

  • Few customers complained about the poor quality of device.
  • Others are disappointed with the poor customer service.

  • Rating 4.6 based on 50 reviews
  • 94% of the reviewers give 4+ stars to this instantaneous water heater


5 – Stiebel Eltron Gmbh

4.5 review starsRating 4.6 based on 141 reviews

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Stiebel Eltron DHC-E8/10 Electronic Instantaneous Water Heater

Here’s what the reviewers think about the Stiebel Eltron Gmbh:

Reviewers like these things about the Stiebel Eltron Gmbh

  • Some customers are pleased with the ease of installation.
  • Others laud the clear instructions.
  • Several users pointed out that the device is well made.
  • Few buyers are happy with the fast shipment.
  • Others like that the device is compact and saves space.
  • Some customers said that it saves electricity.
  • Many users are happy as it provides with surplus amount of hot water.
  • Others like that the temperature is easily adjustable according to requirement.
  • Several customers said that the device is worth the money.
  • Some buyers are pleased with the customer service.
  • A couple of reviewers pointed out that it supplies constant hot water.
  • Majority of users like that it heats water instantly.
  • Very few customers find it visually pleasing.

Reviewers don’t like these things

  • Few customers are disappointed as the water does not heat fast enough.
  • Others said that it does not heats up the water as expected.
  • Very few buyers are disappointed as the device does not last long.

  • Rating 4.6 based on 141 reviews
  • 89% of the reviewers give 4+ stars to this instantaneous water heater


6 – ATC

4.5 review starsRating 4.4 based on 41 reviews

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ATC Water Heaters (5 Litre)

Here’s what the reviewers think about the ATC:

Reviewers like these things about the ATC

  • Several customers laud the item for its easy installation.
  • A couple of users admire its good quality.
  • Many reviewers are happy as it heats the water quickly.
  • Others find the flowrate impressive.
  • A lot of customers said that it provides with plenty of hot water which is sufficient for their needs.
  • A couple of reviewers said that it keeps the water hot for many hours as it is well insulated.
  • Some users said that the size matches the description.
  • Few pointed out that the device is well isolated.
  • Few users are happy with the fast delivery.
  • Others admire the packaging of item.
  • Several buyers find the item inexpensive.

Reviewers don’t like these things

  • Few reviewers said that it does not deliver as much volume of hot water as expected.
  • One buyer said that the instructions are a bit ambiguous.
  • Very few customers are disappointed as the device didn’t work properly.

  • Rating 4.4 based on 41 reviews
  • 81% of the reviewers give 4+ stars to this instantaneous water heater


7 – Samger Samger

4.5 review starsRating 4.4 based on 31 reviews

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Samger Samger 12L Tankless Water Heater Digital Display 3.2GPM LPG Instant Water Boiler Stainless Steel Liquefied Petroleum Gas Hot Water Burner

Here’s what the reviewers think about the Samger Samger:

Reviewers like these things about the Samger Samger

  • Few customers laud the excellent customer service.
  • Others are pleased as the item is easy to install.
  • A couple of users are happy as the boiler is easy to operate.
  • Several users pointed out that it serves its purpose well.
  • Some buyers laud its compact size.
  • Others find it a good value for money.

Reviewers don’t like these things

  • Some customers find it inconvenient that the instruction manual in not in English.
  • One buyer complained about receiving damaged item.

  • Rating 4.4 based on 31 reviews
  • 92% of the reviewers give 4+ stars to this instantaneous water heater


8 – Hyco

4.5 review starsRating 4.3 based on 31 reviews

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Hyco Water Heater SF05K 2.0kW 5L

Here’s what the reviewers think about the Hyco:

Reviewers like these things about the Hyco

  • Many customers are happy as it is easy to fit.
  • Several buyers admire its compact design.
  • Others are happy as it fits great under the sink.
  • Few reviewers admired the delivery service.
  • A lot of buyers are satisfied as it heats up water quickly.
  • Many customers said that it serves its purpose well.
  • A couple of reviewers like that the device is thermostatically adjustable.
  • Others are pleased as it is a good value for money.

Reviewers don’t like these things

  • One customer pointed out that it can only hold 5 liters of water.

  • Rating 4.3 based on 31 reviews
  • 90% of the reviewers give 4+ stars to this instantaneous water heater


9 – CAMPLUX

4.5 review starsRating 4.2 based on 38 reviews

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Camplux BW158BC 6L Instant Gas Water Heater with Rain Cap, CE Certified GAR Standard Tankless Propane Gas Boiler, Use for Outdoor Shower Camping RV Trip Horse Washing

Here’s what the reviewers think about the CAMPLUX:

Reviewers like these things about the CAMPLUX

  • A lot of customers like that the boiler is easy to fit.
  • Others said the item is easy to use.
  • Several buyers pointed out that the item is well made.
  • Few users are pleased with easy-to-follow instructions.
  • Several buyers pointed out that the boiler is economical.
  • A couple of reviewers laud the excellent customer service.
  • Many reviewers mentioned that it does its job perfectly.
  • Others like that it heats the water instantaneously.
  • A couple of buyers laud its compact size.

Reviewers don’t like these things

  • Few buyers are disappointed as the boiler is not approved for Germany.
  • One customer is disappointed on receiving faulty item.

  • Rating 4.2 based on 38 reviews
  • 83% of the reviewers give 4+ stars to this instantaneous water heater


10 – FVSTR

4 review starsRating 4.1 based on 37 reviews

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FVSTR-Swime 8L Propane Gas Lpg 2GPM Instant Hot Water Heater Tankless Boiler CE w/Shower

Here’s what the reviewers think about the FVSTR:

Reviewers like these things about the FVSTR

  • A couple of buyers find it perfect for outdoor showers.
  • A lot of reviewers are impressed with its functionality.
  • Several customers are pleased as the heater ignites automatically when the water passes through it.
  • Few purchasers are pleased with easy-to-follow instructions.
  • Others laud the item for the ease of installation.
  • Several customers find it a good value for money.
  • Others said that the price is low.
  • Some reviewers find the customer service impressive.
  • A couple of buyers pointed out that it matches its description well.
  • Some users like that the item is portable.
  • Many customers are impressed with the quality of item.

Reviewers don’t like these things

  • A couple of users complained that it does not have standard connectors for propane gas regulator.
  • Some buyers are displeased as the package was delivered with missing parts.

  • Rating 4.1 based on 37 reviews
  • 79% of the reviewers give 4+ stars to this instantaneous water heater

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Notes about this top 10 list


The list was last updated 21 December 2020.

The list shows the best reviewed instantaneous water heaters from a much bigger list of selected products. The list should not be considered a complete list of all available, excellent instantaneous water heaters.

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