Stiebel Eltron makes some of the best whole home electric tankless water heaters. The Tempra Plus and Tempra Trend lines are their two flagship products for whole home use. In this article we cover the Tempra Plus line up, with particular focus on the Tempra Plus 20, Tempra Plus 24, and Tempra Plus 29 models.

Stiebel Eltron Tempra Plus 20

Stiebel Eltron Tempra 20 Plus is a reliable option if you want to save on your electricity bills without compromising on the quality and efficiency of the water heater. Tempra Plus series is an upgraded version of the Tempra series and therefore, it offers many more exclusive features and technologically this new range is also very advanced. Tempra Plus range of tankless water heaters comes with heavy-duty parts, simple single-flow sensor design, Advanced Flow Control feature and a hinged cover for extra convenience. This indeed is the next-gen German tankless heater. In comparison to the gas-type models this electric tankless heater is a better choice because it is inexpensive, gets installed easily and doesn’t require venting. Through its Advanced Flow Control system, the heater automatically adjusts water temperature despite an increase in demand. This means, you can say bye to irritating fluctuations in water temperature.

Features

  • Digital temperature control
  • Reliable and durable
  • Venting not needed
  • Small and compact design to suit any area size
  • Energy efficient heater that saves around 15 to 20 percent of your regular expenses in hot water portion
  • Advanced Flow Control helps in maintaining constant and even hot water supply regardless of the increasing demand

Pros

  • Tempra Plus 20 heater is perfect option specifically if there is hard water present because you can lower temperature for reducing scale creation
  • Compact, sleek and space saving design
  • Digital thermostat makes it easy for users to set desired temperature and check temperature
  • Advanced Flow Control regulates even hot water supply no matter if one shower is in use or a shower and a sink
  • Saves around 15 to 20% of your electricity bills
  • Easy to install heater and no need to vent
  • Since it doesn’t contain storage tank therefore you don’t have to drain and clean it every year

Cons

  • This heater is somewhat inefficient because sometimes temperature has to be turned up for acquiring the desired water level and even then water pressure remains low
  • Considering the 3/4 inches water line with 65lbs pressure it doesn’t offer sufficient water flow to take a satisfactory shower
  • When it is working, it is possible that other electrical appliances or connections such as bulbs stop working or start flickering
  • Extensive installation requirements make this heater an expensive choice plus you will need a to hire a professional electrician to properly install it

Installation and Specifications

The heater comes with a comprehensive installation guide, which can be used if installing it manually. However, we recommend that you hire a certified electrician to avoid any complications and damages. Tempra 20 needs 2x50amp 2pole breakers and the circuits will require 6 or 8 gauge copper wire. The heater comes with built-in mounting holes therefore mounting it on the wall won’t be a trouble for you at all.

SpecificationValue
Amperage (amps)80
Electric Product TypeCommercial & Residential
Finish FamilyGray
Minimum Temperature (F)86
Product Weight (lb.)15.4 lb
Water Connection LocationBottom
Wattage (watts)19200
Minimum Activation Rate (gpm)0.58
Indoor/OutdoorIndoor
Maximum Temperature (F)140
Flow Rate @ 35 F Rise (gallons/min)3.75 gal (US)/min
Flow Rate @ 45 F Rise (gallons/min)2.91 gal (US)/min
Fuel TypeElectric
Product Depth (in.)4.625
Product Height (in.)14.5
Product Width (in.)16.625
Water Connection Size (in.)3/4” NPT

Common Problems

This tankless water heater offers plenty of hot water without any fluctuation and remains trouble free for years. However, we suggest that you perform a food grade vinegar flush for one hour all over the unit at least once a year so that any sort of calcium or scale build-up gets eliminated. This tip is very helpful if there is hard water present.

Ideal Use

Tempra 20 is a relatively cheap and efficient tankless water heater that promises considerable reduction in your monthly electricity bills. You can easily run two showers simultaneously without any fear of cold water splashes because it comes with Advanced Flow Control technology. Go for it because this is a reliable water heater.

Stiebel Eltron Tempra Plus 24

Stiebel Eltron Tempra 24 Plus is truly a next-gen unit because technologically it is way ahead from all the other commonly available tankless water heaters. Stiebel has completely been revised and upgraded its Tempra series to meet the requirements of modern day techno-savvy consumers. Tempra plus range is now equipped with heavy-duty components and energy-saving yet steady heating mechanism, which lets you save at least 20% of your electricity bill.

Features

  • Digital temperature control system
  • User-friendly single flow sensor design,
  • Compact and Sleek outlook makes it easy to be fitted just about anywhere
  • Hinged cover for ensuring easy access
  • Highly advanced flow control system
  • Reliable and durable product

Users can easily adjust hot water temperature with their fingertips through the dial. In comparison to gas heaters, Tempra 24 Plus is less expensive yet high on quality and performance. Tempra® Plus’s Advanced Flow Control technology maintains even hot water supply regardless of the frequency of use and thus, eliminates temperature fluctuation. The product weighs 20pound and comes with a three year parts warranty. You can expect a thoroughly satisfying hot water bath when Tempra 24 Plus is doing the job.

Pros

  • Highly efficient water heater for the entire family because it offers unlimited hot water supply
  • Compact size and light weight makes it feasible for small-sized homes and apartments
  • Reduces monthly electricity bill to up to 20%
  • Temperature adjustment is very easy and simple Installation is inexpensive and stress-free. The product comes with a step-by-step guide to help users install it without any outside help
  • Supplies hot water to two showers simultaneously
  • Steady temperature and consistent hot water supply eradicates heating fluctuations and ensures relaxing bathing experience in all seasons
  • The unit contains a comprehensive digital temperature read out so that users can easily understand the temperature that they are getting

Cons

  • Installation wise the electrical set-up is trickier whereas the plumbing requirements are simpler
  • The heater can be installed by users but minor mistake can result in power supply fluctuations and uneven hot water supply. Therefore, professional help is mandatory and it can be expensive.
  • To ensure constant water temperature you need to maintain high flow of water and if water flow is low then pressure will minimize and temperature fluctuations can occur.
  • Although the unit has been designed to provide consistent hot water supply to two showers at a time but the probability of temperature fluctuations cannot be overlooked and cold sandwich effect can hit you occasionally.

Installation and Specifications

Tempra 24 Plus can be installed easily and very economically because it does not require to be vented from the outside like conventional gas tankless heaters. You can either get it installed from a professional or adopt a DIY approach. The unit comes with an instruction manual and manufacturer’s guidelines about the required wiring and other components. To install the unit, you need to buy 6 wire gages because wiring has to be double fused and run twice from the panel box. Two 60amp circuit breakers are required to be installed with 6gage wiring in order to pull 115AMP. For plumbing, you should buy steel braid hoses and to connect input and output hoses buy flexible connectors. Initially set the temperature at 109degrees as per the manufacturer’s recommendation and wait for 10-15 seconds so that water starts heating.

SpecificationsValue
Assembled Depth4.625″
Assembled Height14.5″
Assembled Width16.625″
Product Depth4.625″
Product Height14.5″
Product Width16.625″
Water Connection Size3/4″ NPT
Amperage (amps)100
Electric Product TypeCommercial & Residential
Finish FamilyGray
Flow Rate @ 35 F Rise (gallons/min)4.68 gal (US)/min
Flow Rate @ 45 F Rise (gallons/min)3.64 gal
Fuel TypeElectric
Indoor/OutdoorIndoor
Maximum Temperature (F)140
Minimum Activation Rate (gpm)0.58
Minimum Temperature (F)86
Point-Of-UseNo
Product Weight (lb.)15.4 lb
Residential/Commercial/industrial UseResidential, commercial or industrial
ModelTempra 24 Plus
Water Connection LocationBottom
Water Heater FeaturesOverheat Protection
Wattage (watts)24000

Common Problems

Tempra 24 is no doubt an extremely efficient, energy saving and affordable option especially if you don’t have too much available space. It does the job fairly well in comparison to other tankless electric water heaters. The only problem that it has is of high installation cost and intricacy of its electrical wiring. The installation cost can be high if you are not well-informed about technicalities of electrical wiring. Moreover, the unit’s design sometimes hampers its efficiency.

Ideal Use

The Stiebel Tempra 24 is an excellent tankless water heater. It does its job, and does it well, and is an improvement over several other Stiebel products. That being said, the flaw in its design does hamper its efficiency somewhat, and the high installation costs must be taken into consideration whilst deciding whether or not to purchase this product.

Stiebel Eltron Tempra Plus 29

Stiebel Eltron Tempra 29 Plus is one of the most technologically advanced and reliable Tankless Water Heaters currently available in the market. Stiebel has redesigned its Tempra series units and the new Tempra Plus range of water heaters have advanced Flow Control system, heavy-duty electronics, hinged cover and simplistic single flow sensor design.  In comparison to other gas tankless models the Tempra plus range is very affordable, energy efficient and long lasting. Installation is fairly simple and user friendly since venting is not required. This heater has a digital temperature display and easy-to-use dial selector through which you can set your desired output water temperature between 86 and 125F/30 and 52C. The best feature of Tempra 29 Plus is that it automatically senses and adjusts water flow rate as well as its temperature and calculates the amount of power required to heat the water. This is how it applies exactly as much power as is needed to maintain the demanded output temperature despite the changes in flow rate. We recommend that you get it installed by a professional.

Features

  • Reliable heater with sleek, space saving European design that easily fits anywhere as it is relatively smaller than a tank
  • Digital display for temperature selection and controlling
  • Venting not required
  • 208 or 240 Volt electric connection is required with a max draw of 21,600W at 208V or 28,800W at 240V
  • Power draw= 120amps
  • Requires 50amp circuit breakers and 8gauge copper wiring
  • 99% energy efficiency and 15-20 percent savings
  • ETL listed for abiding with CSA and UL safety standards in the United States and Canada
  • Excused from Seismic Code
  • Contains thermal and overheat safety protection
  • Three year residential and commercial warranty under normal use
  • Advanced flow control feature allows automatic flow reduction in delivering water if demand exceeds capacity

Pros

  • This is comparatively a better choice than tank-type water heater models especially in hard water areas because you can set it on low temperature for minimizing scale formation
  • Space saving and stylish design immediately fits into any given area
  • Digital thermostat keeps water to the exact same temperature as you set
  • Advanced Flow Control ensures you get hot water regardless of the demand. That is, no matter if one shower is in use or three water temperature remains constant
  • At least 15 to 20 percent electricity bill is saved on hot water production
  • User manual is very helpful and explanatory
  • Easy to install unit without requiring expensive mixing of valves or additional temperature regulators
  • No need to drain and clean your storage tank every year and replace anode rods because it heats water directly and thus, there is no storage tank

Cons

  • The unit needs dedicated water line
  • Some users complain that while the heater is in use a number of other appliances like bulbs or fluorescent fixtures start flickering
  • Installation is although easy but a bit expensive because you will need a new electrical box, 8gauge wire and 3x50amp breakers. Plus, a professional electrician only can install it

Installation and Specifications

SpecificationValue
Amperage (amps)120
Electric Product TypeCommercial & Residential
Finish FamilyGray
Minimum Temperature (F)86
Product Weight (lb.)17.6 lb
Water Connection LocationBottom
Wattage (watts)28800
Minimum Activation Rate (gpm)0.87
Indoor/OutdoorIndoor
Maximum Temperature (F)140
Flow Rate @ 35 F Rise (gallons/min)5.62 gal (US)/min
Flow Rate @ 45 F Rise (gallons/min)4.37 gal (US)/min
Fuel TypeElectric
Product Depth (in.)4.625
Product Height (in.)14.5
Product Width (in.)16.625
Water Connection Size (in.)3/4” NPT

Common Problems

Never use substandard wiring while installing this unit and always use those recommended by the maker. If you use low-quality and/or very thin wiring the chances of putting your house on fire are high. Moreover, never install the heater yourself and ask for professional help.  Use detachable water connections like the braided steel flex connectors for ensuring periodic filter cleaning especially flushing away scale if there is hard water. If you aren’t certain about the electrical capacity within your household then consult an electrician before purchasing the product.

Ideal Use

Tempra® Plus is a very reliable, affordable and easy-to-use tankless water heater. It is equipped with the Advanced Flow Control technology that ensures the water temperature remains constant no matter how much the demand exceeds. This means you will receive a satisfying supply of hot water as per your requirement without the fear of cold water splashes while bathing or dishwashing. For this price tag it is the best choice in the currently available water heaters.