Maximum Inlet/Outlet Temperatures for Stiebel Eltron Tempra Plus Electric Tankless

Stiebel Eltron manufactures a variety of whole house electric tankless water heaters.  The Tempra B and Tempra Plus units are designed to supply hot water for a house, apartment or certain commercial applications. Unlike a conventional storage type water heater the Tempra tankless water heater does not store hot water. Instead, water is heated instantaneously as it flows through the unit. The Tempra offers greater energy efficiency than storage type water heaters due to the absence of stand-by losses and reduced hot water pipe runs.

The Stiebel Eltron Tempra B and Tempra Plus units can accept pre-heated inlet water up to 131 degrees and have a maximum output temperature of 140 degrees F.  The Tempra units have a built in sensor that detects the incoming and outgoing temperatures and adjusts itself electronically.  The Tempra Plus units also have a setting inside the unit and the maximum water temperature can be locked in up to 109 degrees in some situations for safety purposes.

The Stiebel Eltron models are the:
Tempra 12  Plus
Tempra 15  Plus
Tempra 20  Plus
Tempra 24  Plus
Tempra 29  Plus
Tempra 36  Plus

Please call GlobalTowne at 888-726-9752 for further questions or to see about ordering a Stiebel Eltron unit.

Bosch Tronic 6000C WH27 Replacing the Powerstar AE-125

GlobalTowne will now be offering the Bosch Tronic 6000C WH27 to replace the Powerstar AE-125. The original Powerstar AE-125 was a retail model heater but Bosch Thermotechnology is moving away from selling retail heaters.  The new model now will be the Bosch Tronic 6000C WH27.  The Bosch WH27 has almost the same features and physical dimensions as the Powerstar AE-125.  The Bosch WH27 now comes with a digital display on the front of the unit and also has a thermostatic control knob on the front.  Below are some of the specifications of the new Bosch Tronic 6000C WH27.

Please be aware that the Bosch Tronic 6000C WH27 requires the home to be equipped with at least a 200 amp service.
Bosch WH27 requires 3 - double pole 40 amp breakers
Requires 8 gauge wire
Activation flow rate of 0.8 gpm
Water pressure range is 15 - 150 psi
Thermal efficiency is 97 %
75 degree rise @ 2.4 gpm
60 degree rise @ 3 gpm
45 degree rise at 3.5 gpm

PCB Boards for Powerstar AE-115 & AE-125 Electric Tankless

Bosch has made many upgrades and improvements to the Bosch Powerstar AE-115 and Powerstar AE-125 electric tankless water heaters.  One of the main improvements is in the Printed Circuit Board (PCB) that basically controls the heater.  Below is a list of the older and newer Powerstar AE115 & AE125 PCB board part numbers and the cutoff dates.

Older Powerstar AE-115 & AE-125 with Copper Canisters and serial number BEFORE #59:
AE-115 PCB Board - #93-793777
AE-125 PCB Board - #93-793778

Powerstar AE-115 & AE-125 with Polymer Modules and serial number 60 through 107:
AE-115 PCB Board - #93-793843
AE-125 PCB Board - #93-793844

New Powerstar AE-115 & AE-125 with Polymer Modules and serial number 108 and above:
AE-115 PCB Board - #8738701732 (87387017320)
AE-125 PCB Board - #8738701738 (87387017380)

Descaling Powerstar AE-115 & AE-125

The electric tankless water heaters, Powerstar models AE115 and AE125 are high kilowatt electric tankless heaters that heat water on demand as the water passes through them. The modules inside consist of coiled elements that heat the water. The heating elements produce extreme heat inside the modules to heat the water on demand.

The heat that is produced by the heating elements in the modules sometimes counteracts with the mineral deposits in the water. If there is a high mineral content due to a hard water area then these mineral deposits known as "scale deposits" will over time attach themselves to the heating coils inside the modules.

All Bosch Powerstar electric tankless water heaters should never be descaled with any type of solution such as vinegar, muriatic acid, etc. The use of descalants flushed through the heater does not have much effect on the mineral deposits attached to the elements. Another point of trying to flush descalant through an electric tankless heater is that it will loosen some of the mineral deposits in the heater and will have a damaging effect on the flow transducer and other parts inside the tankless heater that detects the flow of water and will interrupt the signal to the circuit board itself.

The best protection against mineral deposits (scale) forming on the coils in the electric tankless heater is to check the quality of the water in your area before installing and if the water has a high mineral content then it is recommended to install a water softener or scale stopper system. The water softener or scale stopper will filter out almost all of the minerals and treat the water so the electric tankless water heater will have a longer life with less minerals building up inside.

PowerStream and PowerStar Catalog Numbers

Do you have an old PowerStream or PowerStream Pro or PowerStar electric whole-house tankless water heater or electric point-of-use tankless water heater and need to replace it? Only have the Catalog number?

Call us at 888.726.9752 and we can translate this catalog number into the current replacement model number.

Old catalog numbers include:

Powerstar 45550301 or 45-550301

Powerstar 45551301 or 45-551301

Powerstream 45793214 or 45-793214

Powerstream 45793219 or 45-793219

Powerstream 45793217 or 45-793217

Powerstream 45793238 or 45-793238

Powerstream 45793207 or 45-793207

Powerstream 45596702 or 45-596702

Powerstream 45793228 or 45-793228

Powerstream Pro 45550302 or 45-550302

Powerstream Pro 45551702 or 45-551702

Powerstream Pro 45551302 or 45-551302

Powerstream Pro 45557702 or 45-557702

Powerstream Pro 45553701 or 45-553701

Powerstream Pro 45553702 or 45-553702

Powerstream Pro 45553703 or 45-553703

Powerstream Pro 45553704 or 45-553704

Powerstream Pro 45553705 or 45-553705

Powerstream Pro 45553710 or 45-553710

Powerstar 45550301 or 45-550301

Powerstar 45551701 or 45-551701

Powerstar 45551301 or 45-551301

Powerstar 45557701 or 45-557701

Powerstar 45552701 or 45-552701

Powerstar 45552703 or 45-552703

Powerstar 45552704 or 45-552704

Powerstar 45552710 or 45-552710

We stock all of these units.

Steve

PCB Control Boards for Powerstar AE-115 & AE-125

The PCB control board (Printed Circuit Board) is a thermostatically controlled circuit board that allows the electric tankless water heater, model AE115 & AE125 to be manually controlled by a temperature dial that would range in temperature from 86-131 degrees. The PCB in conjunction with a flow transducer enables the PCB to turn on additional elements in the heater as necessary depending on the amount of gallons per minute (gpm) flowing through the heater.

The PCB would recognize many factors in the function of the heater to maintain a steady temperature and all of this is determined on where the temperature knob is set too, the gpm flowing through the heater and the temperature of the incoming ground water.

To obtain the maximum heating potential of the Powerstar electric tankless water heater, it must be wired correctly and have the full required voltage to the unit. The Powerstar AE115 would require 2 independent double pole 40 amp breakers wired with 8 gauge wire and could draw a maximum of 80 amps at full flow through the heater. The Powerstar AE115 would require the home to be supplied with a minimum of a 150 amp service. The Powerstar AE125 would require 3 independent double pole 40 amp breakers wired with 8 gauge wire and could draw a maximum of 120 amps at full flow through the heater. The Powerstar AE125 would require the home to be supplied with a minimum of a 200 amp service.

The maximum inlet water temperature allowed into the heater is 86 degrees Fahrenheit.

The Powerstar AE-115 & AE-125 have had many upgrades and engineering improvements over the years. In January 2007 the AE-115 & AE-125 went from having copper canisters that contain the heating elements to an upgraded Polymer module. The PCB control board was also upgraded to maintain a more steady temperature that works with the heating elements in the polymer modules.

Below are the designated PCB control board part numbers for the units before and after 2007.

Before 2007 with serial #60A 00000 or lower:
Powerstar AE-115 PCB with copper can units, part #93-793777
Powerstar AE-125 PCB with copper can units, part #93-793778

After 2007 with serial #60A 80000 or higher:
Powerstar AE-115 PCB with polymer units, part #93-793843
Powerstar AE-125 PCB with polymer units, part #93-793844

POWERSTAR AE-115 AND AE-125

The Powerstar Electric Tankless Water heaters model Powerstar AE-115 and Powerstar AE-125 are designed for whole house use and would replace a traditional 40 gallon electric tank heater that will provide endless hot water throughout the home. With two powerful and compact models to choose from, AE-115 or AE-125 it will fit just about anywhere and is built to last.

These 2 Powerstar units have specific power requirements as the AE-115 would require the home to have a minimum of a 150 amp service to the home and would require 2 double pole 40 amp breakers wired with #8 gauge wire as the unit can draw up to 80 amps when at full usage. The AE-125 would require the home to have a minimum of a 200 amp service to the home and would require 3 double pole 40 amp breakers wired with #8 gauge wire as the unit can draw up to 120 amps when at full usage. Please view this link for the AE115 and AE125 power requirements:

The Powerstar AE-115 & AE-125 models have had many new upgrades over the years. The biggest upgrade was that the canisters inside the tankless heater used to have copper canisters and then in 2007 they were upgraded to poly tanks that are more durable and would handle expansion and contraction of the heat better and would be less susceptible to mineral buildup.

The Powerstar AE-115 is designed for 1 major application at a time and is recommended for installation in homes that are in the southern regions of the United States as the incoming ground water is warmer giving the heater a higher temperature degree rise.

The Powerstar AE-125 is designed for 1 major application and 1 sink at a time and is recommended for installation in homes that are in the northern region of the United States where the incoming ground water is cooler and this heater will be able to give a higher degree temperature rise.

The Manufacturer of the Powerstar AE-115 & AE-125 require that there must be at least 3-4 feet of copper water piping coming from the units on the hot and cold water side before attaching to any pex piping as this is due to thermal expansion.

The Powerstar AE-115 & AE-125 are both UL & CSA approved.

Keltech Electric Tankless Water Heaters

Keltech Electric Tankless Water Heaters

Electric tankless water heaters are an alternative water heating solution compared to the traditional boiler or tank. In a Keltech tankless water heater, water is quickly heated to temperature as it passes through the copper and brass constructed heater core. Tankless water heaters are also referred to as “on-demand,” “in-line” or “booster” water heaters.

The Keltech Tankless Advantage

1. Precise Temperature Control Keltech water heating solutions can be programmed to meet a specific temperature range. If needed, Keltech can also heat water precisely to within +/- 1 degree for temperature sensitive applications. Keltech safety shower heaters and eyewash heaters quickly reach ANSI compliant tepid water temperatures.
2. Energy EfficientWater is heated only when needed. Unlike a boiler, there is no need to heat water 24 hours a day, 7 days a week, 365 days a year. That saves money, energy and water.
3. Compact SizeKeltech tankless water heating solutions are modular and take up a fraction of the space compared to a boiler.
4. Built to LastKeltech water heaters feature quality control systems and premium materials like copper and brass to meet the most demanding conditions.

Standard Water Heating Applications
Keltech’s commercial grade tankless water heaters and fluid heating solutions are built for commercial and industrial process heating applications. Keltech heaters are used in applications as varied as:

• Safety shower and emergency eyewash applications
• Large industrial process heating
• Sporadic water heating for laboratories
• Light industrial process heating
• Aircraft hot water delivery systems
• Residential systems
• De-ionized water heating solutions
• Corrosive fluid heating protection systems
• Non-flammable fluid heating applications
• Other on-demand water heating applications
• Bio-diesel vegetable oil heating at 230°F
• Removing residue and oils from machine parts
• Circuit board flux removal
• Legionella prevention
• ANSI compliant safety shower heaters and systems
• ANSI compliant emergency eyewash heaters

Tankless Water Heaters and Water Heating Solutions for Extreme Environments

Freeze ProtectionWater heating solutions can be freeze protected to perform when air temperatures get as cold as -30°F.

Explosion Proof
Keltech also manufactures Class 1 Div 2 explosion proof solutions for highly volatile or flammable areas where water or chemicals must be heated.

NEMA 4x Enclosures
Keltech also produces water heaters that can be sealed in NEMA 4x enclosures to protect the investment from corrosive conditions and hostile environments.

Specialty ApplicationsKeltech also engineers and manufactures custom built tankless water heating solutions that are capable of heating:

• De-ionized Water
• Reverse Osmosis Fluids
• Corrosive Fluids
• Non-Flammable Fluids