STIEBEL ELTRON Mini 2-1 Tankless Electric Water Heater User Manual

STIEBEL ELTRON Mini 2-1 Tankless Electric Water Heater

General Information

Read this entire manual. Failure to follow all the guides, instructions and rules could cause personal injury or property damage.  Improper installation, adjustment, alteration, service and use ofthis unit can result in serious injury. This unit must be installed by a licensed electrician and plumber. The installation must comply with all national, state and local plumbing and electric codes. Proper installation is the responsibility of theinstaller. Failure to comply with the installation and operating instructions or improper use voids the warranty. Save these instructions for future reference. Installer should leavethese instructions with the consumer. If you have any questions regarding the installation, use or operation of this water heater, or if you need any additional installation manuals, please call our technical service line at 800.582.8423 (USA and Canada only). If you are calling from outside the USA or Canada, please call USA 413.247.3380 and we will refer you to a qualified Stiebel Eltron service representative in your area.

WARNING

This is the safety alert symbol. It is used to alert you to potential personal injury hazard. Obey all safety messages that follow this symbol to avoid possible injury or death. The chapter Operation is intended for homeowners, heating
contractors, plumbers and electricians. The chapter Installation is intended for heating contractors, plumbers and electricians only.

Symbol key

Layout of safety information

DANGER: Electrocution Before any work on the appliance, disconnect all poles from the power supply.

1. Symbol (see 1.1.2 “Symbols”, below)
2. Keyword (see 1.1.3 “Keywords”, below)
3. Description (see 1.1.2 “Symbols”, below)
4. Information text

Symbols

Keywords

Safety precautions

Please read and follow these instructions. Failure to follow these instructions could result in serious bodily injury or death. The unit must be installed by a licensed electrician and plumber. The installation must comply with all national, state and local plumbing and electric codes. Service of the unit must be performed by qualified service technicians. Before proceeding with any installation, adjustment, alteration, or service of this unit, all circuit breakers and disconnect switches servicing the unit must be turned off. Failure to do so could result in serious personal injury or death.

DANGER: Never remove the unit’s cover unless the electricity servicing the unit is turned off. Failure to do so could result in personal injury or death.

WARNING: The unit must be properly grounded. Failure to electrically ground the product could result in serious personal injury or death.

DANGER: Water temperatures over 125 °F (52 °C) can cause severe burns instantly or death from scalding. A hot water scalding potential exists if the output from the unit is too high. Households with small children, disabled elderly persons may require that a mixing valve be installed to deliver water temperatures of 120 °F (49 °C) or lower to prevent possible injury from hot water.

Register your product

You must register this product within 90 days of purchase on our web site in order to activate the standard warranty or to be eligible for the extended warranty. Go to our web site at www.stiebel-eltron-usa.com and click on register your product. Before beginning the registration process, we suggest that you gather the necessary information which will be as follows:

Type, Example: Mini 3-1 (from the white label that is on the right side of the unit)

• Number listed after “Nr.”
• Place of Purchase
• Purchase Date
• First & Last Name
• Email address
• Physical Address
• Phone Number

If you have any questions concerning the registration process or warranty options, please contact Stiebel Eltron USA directly at 800.582.8423.

Temperature increase above ambient water temperature

Mini 2-1 is internally restricted to 0.32 gpm (1.2 l/min)

Technical drawings

1. Hot water connection
2. Cold water connection
3. Filter screen
4. Mounting holes
5. Electrical junction box
6. Water supply line
7. Sink
8. Cold valve (right)
9. Hot valve (left)
10. Shut off valve

This manual must be read carefully before attempting to install the Mini water heater. If you do not follow the safety rules or the instructions outlined in this manual, the unit may not operate properly and it could cause property damage, serious bodily injury and/or death. Stiebel Eltron, Inc. will not be liable for any damages because of failure to comply with the installation and operating instructions outlined in this manual or because of improper use. Improper use includes the use of this appliance to heat any liquid other than water. Failure to comply with the installation and operating instructions or improper use voids warranty. Never remove the unit’s cover unless the electricity is turned off. If you have any questions regarding the installation or operation of this water heater, or if you need any additional installation manuals, please call our technical service line on 800.582.8423 (USA and Canada only). If you are calling from outside the U.S. Or Canada, please call usa 413.247.3380 and we will refer you to a qualified Stiebel Eltron service representative in your area.

Overview

General Description
The Mini tankless water heater differs from conventional storage type water heaters in several ways. It does not store hot water. Instead, water is heated instantaneously as it flows through the  unit. The powerful heating elements are activated by a flow switch as water is drawn from a hot water faucet connected to the Mini. Due to the absence of standby losses, the Mini offers greater energy efficiency than storage type water heaters. The unit will continuously supply hot water as long as the faucet is open. The temperature of the hot water delivered by the Mini depends on the wattage of the heating element, the temperature of the incoming cold water, and the water flow rate through the unit.  In order for the Mini to operate properly, it must be carefully matched to the application.  In case you have questions regarding the way you plan to use theMini, please call our technical service line at 800.582.8423 (USA and Canada). For service outside the U.S. and Canada, please call us at USA 413.247.3380. You can also email us at info@stiebel-eltron- usa.com or fax us at 413.247.3369. The Mini can be used for hand washing type applications in the
U.S. and Canada:

• Restroom sinks in commercial/industrial facilities and homes
• Kitchen areas in commercial /industrial facilities and homes
• Cabins
• Special uses in photo developing shops, laboratories etc.

The Mini can also be used for whole apartments and homes in warm climate zones such as the Caribbean region, Central America and Mexico due to the higher ambient water temperatures.

Important information before supplying power to unit

Air in the cold water pipe will destroy the Advanced Direct Coil™ heating system of the Mini. If the water supply to the Mini has been interrupted, for example due to the risk of frost or work on the water pipe, the following steps must be carried out before the unit is used again.

1. Turn off circuit breaker.
2. Open a hot water tap downstream of the unit for as long as is necessary for the unit and the cold water pipe to be free of air.
3. Turn on circuit breaker.

All information in these Instructions for Use and Installation must be followed carefully. They provide important information with regard to safety, operation, installation, and maintenance of the device.

Hot water output using required aerators

All Mini models ship with appropriately sized pressure compensating flow- reducer/aerators that must be installed.

• Mini 2-1 is internally restricted to 0.32 gpm (1.2 l/min)
• Mini 2-1 ships with a 0.35 gpm (1.3 l/min) aerator
• Mini 2.5-1, 3-1 ship with a 0.5 gpm (1.9 l/min) aerator
• Mini 3.5-1, 4-2 ship with 2 aerators, one must be installed. Install the 0.66 gpm aerator and test the water temperature. If the water is not warm enough, remove the 0.66 gpm aerator and install the 0.5 gpm aerator in its place.
• Mini 6-2 ships with a 1.0 gpm (3.8 l/min) aerator

Incorrect use

The following are not permitted and will void the factory warranty:

• Installation of the appliance where it is at risk from frost
• Installation in rooms where the appliance is at risk from explosions as a result of dust, gases or vapors
• Ignoring safety clearances and safety zones
• Incorrect power connection
• Operation of the appliance without water flowing through the unit, or with air in the lines (See section 8, “Initial start-up”, pg. 16)
• Operation of the unit with the cover off
• Heating liquids other than potable water

First steps to be taken in the event of malfunction

WARNING: Always shut off power and water to the unit prior to removing the filter screen. Failure to do so may cause serious bodily injury or death.

• Check the circuit breaker
• Check the filter screen for scale blockage or dirt accumulation. (See section 12, “Troubleshooting”, pg. 19.)

Maintenance and care

Maintenance work, such as checking electrical safety, may only be carried out by a qualified installer.
WARNING: Always shut off power and water to the unit prior to removing the filter screen. Failure to do so maycause serious bodily injury or death. Regularly clean and descale the filter screen located in the cold water
inlet connection and if necessary replace. Always shut off power and water to the unit prior to removing the filter screen. A damp cloth is sufficient for cleaning of the unit’s housing. Do not use any abrasive or corrosive cleaning agents.

Installation instructions

Keep these instructions carefully and pass them on to your successor in the event of a change in ownership, in the event of maintenance and possible repair work they should be passed to the qualified installer for his or her reference.

Mounting the unit

Unit must be installed with the plumbing connections pointing downward or upward only.
WARNING: Do not install unit where it would routinely be splashed with water. Electric shock or death may result.

1. Install Mini as close as possible to the hot water draw-off point, for example, directly underneath the sink or next to the shower stall.
2. Install Mini in a frost free area. If frost may occur, remove unit before freezing temperatures set in.
3. Leave a minimum of 5″ of clearance on all sides for servicing.
4. Remove plastic cover by removing screws located on the left and right sides of the unit B .
5. Remove plastic backplate by pulling on the tab with a screwdriver B .
6. Mount backplate securely to wall by putting two screws through mounting holes A B .
7. Snap unit back onto mounting plate B .
8. Reinstall cover with screws on left and right side of unit B .

Plumbing connections

NOTE: If soldering near the unit is necessary, please direct the flame away from the housing of the unit in order to avoid damage. Excessive heat from soldering on copper pipes near the Mini may cause damage. All plumbing work must comply with national and applicable state and local plumbing codes.

1. All plumbing work must comply with national and applicable state and local plumbing codes.
2. A pressure-reducing valve must be installed if the cold water supply pressure exceeds 150 psi (10 bar).
3. Make certain that the cold water supply line has been flushed to remove any scale and dirt.
4. Install isolating valve in cold water line as shown in illustration C . This allows the unit to be isolated for maintenance purposes.
5. Cold water connection (inlet) is on the right side of the unit, hot water connection (outlet) is on the left side of unit.
6. Tankless water heaters such as the Mini are not required to be equipped with a Pressure and Temperature Relief Valve (except in Massachusetts). If the local inspector will not pass the installation without a P+T valve, it should be installed on the hot water outlet side of unit.
7. The Mini is designed for connection to a braided stainless steel hose with a 3/8˝ O.D. tube outlet.
8. When all plumbing work is completed, check for leaks and take corrective action before proceeding.

Electrical connection

WARNING: Before beginning any work on the electric installation, be sure that the main circuit breaker panel switch is “off” to avoid any danger of electric shock. Failure to doso may result in serious injury or death. All mounting and plumbing must be completed before proceeding with electrical hook-up. Where required by local, state or national electrical codes, the circuit should be equipped with a ground fault interrupter.
WARNING: As with any electric appliance, failure to the electrically ground unit may result in serious injury or death.
CAUTION: Installing a Mini 2-1, Mini 2.5-1, Mini 3-1, or Mini 3.5-1 on a 208 V or 220–240 V circuit will destroy the heating element. This is considered improper installation and will void your factory warranty.

Wiring
For 120 V units, the brown wire of the pigtail should be hooked up to L (Load/Live), the blue wire to N (Neutral), and the green/yellow wire to the ground GND. For 208/240 V units, the brown wire of the pigtail should be hooked up to L1, the blue wire to L2, and the green/yellow wire to the ground GND.

Voltage

1. All electrical work must comply with national and applicable state and local electrical codes.
2. The Mini should be connected to a properly grounded dedicated branch circuit of proper voltage rating. In installa tions with several Mini units, each unit requires an independent circuit. Please refer to the technical data table for the correct wire and circuit breaker size.
3. The open ends of the “pigtail” must be feed into an electrical junction box. Then feed wires through strain relief clamp and tighten clamp down on wire.
4. Reinstall plastic cover.

Initial start-up

WARNING: Open hot water faucet for a few minutes until water flow is continuous and all air is purged from water pipes. The unit’s plastic cover must be installed before the circuit breaker is turned on.

Water heater hand over

Explain the functions of the unit to the user and familiarize him or her with its use.
Important instructions:

• Draw the user’s attention to possible hazards (scalding).
• Hand over these instructions for future reference.
• In order to obtain a proper temperature at a single spout mixer-type faucet, restrict cold water flow to faucet by partially closing the cold water shut-off valve under the sink until cold water and hot water flow rates are approximately the same.

Normal maintenance

CAUTION: Other than the filter screen, the Mini does not contain any parts serviceable by the lay person. In case of malfunction please contact a licensed plumber or electrician.

Stiebel Eltron Mini tankless heaters are designed for a very long service life. Actual life expectancy will vary with water quality  and use. To ensure consistent water flow, it is recommended toperiodically remove scale and dirt that may build up at the aerator of the faucet or in the shower head. Also, the Mini has a built in filter screen that should be cleaned from time to time. In order to do this, turn off the cold water supply at the isolating valve. Clean screen and put the screen back into its original position.

Technical data

Mini 2-1 is internally restricted to 0.32 gpm (1.2 l/min).

1. Nominal mains voltage is 110–120 V and 220–240 V.
2. This is our recommendation for overcurrent protection sized at 100% of load. Check local codes for compliance if necessary. Tankless water heater are considered a non-continuous load.
3. Copper must be used. Conductors should be sized to maintain a voltage drop of less than 3% under load.
4. For use with cold water supply only.

Mini 3.5-1, 4-2 ship with 2 flow-reducer/aerators, one must be installed. Install the 0.66 gpm aerator and test the water temperature. If the water is not warm enough, remove the 0.66 gpm aerator and install the 0.5 gpm aerator in its place.

Troubleshooting

DANGER: Electrocution Do not attempt to reset the safety pressure cutout of this water heater unless power to the unit has been completely shut off at the circuit breakers.

Spare parts

Warranty

Subject to the terms and conditions set forth in this limited warranty, Stiebel Eltron, Inc. (the “Manufacturer”) hereby warrants to the original purchaser (the “Owner”) that each Tankless Electric Domestic Hot Water Heater (the “Heater”) shall not (i) leak due to defects in the Manufacturer’s materials or workmanship for a period of ten (10) years from the date of purchase or (ii) fail due to defects in the Manufacturer’s materials or workmanship for a period of three (3) years from the date of purchase. As the Owner’s sole and exclusive remedy for breach of the above warranty, Manufacturer shall, at the Manufacturer’s discretion, send replacement parts for local repair; retrieve the unit for factory repair, or replace the defective Heater with a replacement unit with comparable operating features. The manufacturer’s maximum liability under all circumstances shall be limited to the Owner’s purchase price for the Heater.  This limited warranty shall be the exclusive warranty made by the manufacturer and is made in lieu of all other warranties, express or implied, whether written or oral, including, but not limited to warranties of merchantability and fi tness for a particular purpose. The manufacturer shall not be liable for incidental, consequential or contingent damages or expenses arising directly or indirectly from any defect in the Heater or the use of the Heater. The manufacturer shall not be liable for any water damage or other damage to the property of the Owner arising, directly or indirectly, from any defect in the Heater or the use of the Heater. The manufacturer alone is authorized to make all warranties on the Manufacturer’s behalf and no statement, warranty or guarantee made by any other party shall be binding on the Manufacturer. The manufacturer shall not be liable for any damage whatsoever relating to or caused by:

1. any misuse or neglect of the Heater, any accident to the Heater, any alteration of the Heater, or any other unintended use;
2. acts of God and circumstances over which the Manufacturer has no control;
3. installation of the Heater other than as directed by the Manufacturer and other than in accordance with applicable building codes;
4. failure to maintain the Heater or to operate the Heater in accordance with the Manufacturer’s specifications;
5. operation of the Heater under fluctuating water pressure or in the event the Heater is supplied with non-potable water, for any duration;
6. improper installation and/or improper materials used by any installer and not relating to defects in parts or workmanship of Manufacturer;
7. moving the Heater from its original place of installation;
8. exposure to freezing conditions;
9. water quality issues such as corrosive water, hard water, and water contaminated with pollutants or additives;

Should the owner wish to return the Heater to the manufacturer for repair or replacement under this warranty, the Owner must first secure written authorization from the Manufacturer. The owner shall demonstrate proof of purchase, including purchase date, and shall be responsible for all removal and transportation costs. If Owner cannot demonstrate a purchase date this warranty shall be limited to the period beginning from the date of manufacture stamped on the Heater. Manufacturer reserves the right to deny warranty coverage upon Manufacturer’s examination of Heater. This warranty is restricted to the Owner and cannot be assigned. Some States and Provinces do not allow the exclusion or limitation of certain warranties. In such cases, the limitations set forth herein may not apply to the Owner. In such cases this warranty shall be limited to the shortest period and lowest damage amounts allowed by law. This warranty gives you specifi c legal rights and you may also have other rights which vary from State to State or Province to Province. The owner shall be responsible for all labor and other charges incurred in the removal or repair of the Heater in the fi eld. Please also note that the Heater must be installed in such a manner that if any leak does occur, the fl ow of water from any leak will not damage the area in which it is installed.

Environment and recycling
Please help us to protect the environment by disposing of the packaging in accordance with the national regulations for waste processing.

References

• Tankless Water Heater | Renewable Energy | Stiebel Eltron USA

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