STIEBEL ELTRON 074055 Electric Tankless Water Heaters User Manual
- June 6, 2024
- STIEBEL ELTRON
Table of Contents
Use and Care Manual
Electric Tankless Water Heaters
! DANGER: ELECTROCUTION
BEFORE PROCEEDING WITH ANY INSTALLATION, ADJUSTMENT, ALTERATION, OR SERVICE,
ALL CIRCUIT BREAKERS AND DISCONNECT SWITCHES SERVICING THE APPLIANCE MUST BE
TURNED OFF. FAILURE TO DO SO COULD RESULT IN SERIOUS PERSONAL INJURY OR DEATH.
! DANGER: ELECTROCUTION
NEVER REMOVE THE APPLIANCE’S COVER UNLESS THE ELECTRICITY SERVICING THE
APPLIANCE IS TURNED OFF. FAILURE TO DO SO COULD RESULT IN PERSONAL INJURY OR
DEATH.
All Tankless Models
Stiebel Eltron tankless water heaters are designed for very long service life.
Actual life expectancy will vary with water quality and use.
In areas with hard water that produces scale, descaling of the entire unit may
be required and should be performed as often as necessary. We recommend the
Flow-Aide System
(Stiebel Eltron part # 540000) for this procedure. In these areas,
consideration should also be given to installing a filter that will prevent
scale buildup on the cold water supply to the water heater. We recommend the
Scale TAC-ler WaterConditioner (Stiebel Eltron part # 692442) for this.
Scale and dirt may build up in the filter screen in the unit and should
periodically be removed. Following all directions and precautions in this
manual, regularly clean the filter
screen and replace it if necessary. Always shut off power to the unit at the
circuit breakers and water at the unit’s isolation valves prior to removing
the filter screen.
Scale and dirt build-up may also occur at the hot water outlets served by the
unit, such as the faucet aerator, or showerhead. Keeping these filter screens
clean will ensure consistent water flow.
CLEANING: Use a damp cloth to clean of the unit’s housing. Do not use any
abrasive or corrosive cleaning agents.
! DANGER: BURNS
WATER TEMPERATURES OVER 125°F (51°C) CAN CAUSE SEVERE BURNS INSTANTLY OR DEATH
FROM SCALDING. A HOT WATER SCALDING POTENTIAL EXISTS IF THE THERMOSTAT ON THE
APPLIANCE IS SET TOO HIGH. HOUSEHOLDS WITH SMALL CHILDREN, DISABLED OR ELDERLY
PERSONS MAY REQUIRE THAT THERMOSTATS BE SET AT 120 °F (48 °C) OR LOWER TO
PREVENT POSSIBLE INJURY FROM HOT WATER.
CAUTION: OTHER THAN THE FILTER SCREEN, THESE APPLIANCES DO NOT CONTAIN ANY
PARTS SERVICEABLE BY THE LAYPERSON. IN CASE OF MALFUNCTION, PLEASE CONTACT A
LICENSED PLUMBER OR ELECTRICIAN.
Mini™and Mini™-E Models
Following all directions and precautions in this manual, regularly clean the
filter screen located in the cold water inlet connection and replace if
necessary. Descaling can be done using a descaling solution or household
vinegar. To access the filter screen in a Mini™, always shut off power to the
unit at the circuit breakers and water at the unit’s isolation valves prior to
removing the filter screen. Then disconnect the cold water supply at the unit.
Remove the filter screen by reaching up into the cold inlet pipe with a small
flathead screwdriver and while putting pressure on the inside of the screen’s
plastic rim, pull the screen down and out. Clean and replace the filter
screen, or install a new one. Never run the unit without the filter screen in
place.
DHC and DHC Classic/Trend Models
The filter screen in DHC models is in one of two locations. In all DHC
Classic/Trend models, and DHC models from 2015 and newer, the screen is
located in the cold water inlet connection, the same as in a Mini ™, DHC-E, or
Tempra®. In older DHC models, the filter screen is located at the top of the
cold water supply tube.
To access the filter screen in a newer DHC model, always shut off power to the
unit at the circuit breakers and water at the unit’s isolation valves prior to
removing the filter screen. Then remove the cold water connection and pull the
filter screen down and out of the unit. Clean and replace the filter screen,
or install a new one, into its original position. Never run the unit without
the filter screen in place.
To access the filter screen in an older DHC model, always shut off power to
the unit at the circuit breakers and water at the unit’s isolation valves
prior to removing the filter screen. Then loosen the nut at the base of the
cold water supply tube. (Refer to the illustration below.) Rotate cold water
supply tube counterclockwise 90 degrees and pull towards bottom of the unit.
Clean screen and put thescreen, the cold water supply tube, and the ground
wire back into their original position. Be sure the ground wire is
reinstalled, the ground screw is securely fastened, and the nut on the cold
water supply tube is tight before the unit is returned to service. Clean and
replace the filter screen, or install a new one, into its original position.
Never run the unit without the filter screen in place.
The outlet temperature of a DHC Trend can be limited to several selectable
internal values. Consult your installer if your unit has been set to a limit
and you require a higher temperature.
DHC-E, DHC-E Trend/Plus, DHX models, and Tempra®models
To access the filter screen in any DHC-E/DHX model, always shut off power to
the unit at the circuit breakers and water at the unit’s isolation valves
prior to removing the filter screen. Then remove the cold water connection and
pull the filter screen down and out of the unit. Clean and replace the filter
screen, or install a new one, into its original position. Never run the unit
without the filter screen in place.
To access the filter screen in a Tempra ® model, always shut off power to the
unit at the circuit breakers and water at the unit’s isolation valves prior to
removing the filter screen. Then remove the cold water inlet connection (the
right-hand side when facing unit) and remove the washer (2). Next, pull the
filter screen (1) down and out of the unit with needle-nose pliers. Clean and
replace the filter screen, or install a new one, into its original position
along with the washer. Never run the unit without the filter screen in place.
The amount of heat put into the water is controlled electronically in Tempra ®
and DHC-E models. Using the knob on the front cover, set the output water
temperature to any
temperature between 86 °F (30 °C) and 140 °F (60 °C). For most applications,
we recommend setting only to the highest temperature for normal use, typically
108°F (42°C) to 116°F (47°C) for a shower. This lower setting will increase
the life of the unit.
The outlet temperature of a Tempra ® Plus, DHC-E 8/10, or DHC-E 12 model can
be limited to 109 °F (43 °C). Consult your installer if your unit has been set
to this limit and you require a higher temperature.
The outlet temperature of a DHC-E Trend or DHC-E Plus can be limited to
several selectable internal values. Consult your installer if your unit has
been set to a limit and you require a higher temperature.
If the “Power” led is flashing on a DHC-E 8/10, DHC-E 12, DHC-E Trend, or
Tempra®Trend unit while it is operating, the water flow rate exceeds the
heating capacity of the unit. Reducing the flow of hot water or setting a
lower temperature will let the unit achieve the set point temperature.
Video tutorial:
Cleaning a Filter Screen on Tempra® Water Heaters
17 West St., W. Hatfield, MA 01088
800.582.8423
413.247.3380
fax 413.247.3369
info@stiebel-eltron-usa.com
www.stiebel-Eltron-usa.com
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