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Bosch WR400-1K Series Installation Operation & Maintenance

Instantaneous gas water heater
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The Bosch instantaneous water heater is a high efficiency,
space saving answer to your water heating needs.
All Bosch instantaneous water heaters heat water only as
required; no energy is lost maintaining a large volume of
water at elevated temperatures as in tank-type storage wa-
ter heaters.
Suitable for heating potable water only. Not approved
for space heating purposes.
NOTICE TO INSTALLER: Please leave this manual with
123 Charles Street
North Vancouver, BC. V7H 1S1
Phone Canada: (604) 929-5488
Phone USA:
(206) 860-8448
Web Site:
Note: In case of problems please contact your salesman or installer.
Instantaneous gas water heater
the owner or affix adjacent to
WARNING: If the information in this manual is not
followed exactly, a fire or explosion may result
causing property damage, personal injury or death.
Do not store or use gasoline or other flammable
vapors and liquids in the vicinity of this or any
other appliance.
Do not try to light any appliance
Do not touch any electrical switch; do not use
any phone in your building.
Immediately call your gas supplier from a
neighbor's phone. Follow the gas supplier's
If you cannot reach your gas supplier, call the
fire department.
Installation and service must be performed by a
qualified installer, service agency or the gas



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  Summary of Contents for Bosch WR400-1K Series

  • Page 1 · Operation · Maintenance The Bosch instantaneous water heater is a high efficiency, space saving answer to your water heating needs. All Bosch instantaneous water heaters heat water only as required; no energy is lost maintaining a large volume of water at elevated temperatures as in tank-type storage wa- ter heaters.
  • Page 2 DIMENSIONS Figure 1 Maximum hydrostatic water pressure – 1.03 Mpa (150 p.s.i.) Maximum recommend working pressure – 0.69 Mpa (100 p.s.i.) Minimum working pressure – 0.0138 Mpa (2 p.s.i.) at 2 Litres/min. (0.5 U.S. Gallons/min) free discharge Minimum recommended inlet water pressure for use with showers 40 p.s.i.g. Dimensions in Milimetres (inches) Model dimensions...
  • Page 3: Installation Instructions

    FOREWORD This design complies with CAN1-4.3-77 and ANS1Z21. 1 0.3b The BOSCH instantaneous gas water heater is designed 1994 as an instantaneous gas water heater. In addition the to operate on natural or propane gas; however make sure unit complies with CAN1-2. 1 7- M80 use at high altitude, that gas on which heter is to operate is the same as specified 2.000- 4.500 feet above sea level.
  • Page 4 For either a confined or unconfined space in a building of MOUNTING tight construction with inadequate infiltration, air must be drawn from the outdoors or from spaces that freely The WR400-1 is design certified for mounting to a wall. communicate with the outdoors. Two permanent openings The heater must not be installed on a carpeted wall.
  • Page 5: Water Connections

    2,000 to 4,500 ft. above sea level will cause unsafe venting, asphyxiation, and voids C.G.A. Certification. WATER CONNECTIONS DRIP TRAY The BOSCH instantaneous water heaters are provided with two S- bend water connectors/adaptors that must be Figure 3 connected to inlet and outlet connections on water valve assembly, see Figure 1 and Figure 5, below.
  • Page 6: Relief Valve

    3.45 kPa (1/2 psig). If overpressure has occurred BOSCH water heaters are shipped from the factory with such as through improper testing of the gas lines or...
  • Page 7: Lighting Instructions

    OPERATING INSTRUCTIONS WARNING! LIGHTING INSTRUCTIONS If the water heater has been damaged or exposed to fire or 1. STOP! Read the safety information above on this plate. sooting, or if any part has been underwater, do not use. 2. The gas valve should be turned off by sliding the gas Immediately call a qualified service technician to inspect valve button to the far left, under the “OFF”...
  • Page 8: Pressure Regulation

    · In Canada, is factory preset to deliver gas at the high The BOSCH WR400-1 is equipped with a modulating gas altitude pressure setting listed on the rating plate and valve which adjusts the flow of gas to the main burner in as shown below;...
  • Page 9: Preventive Maintenance

    PREVENTIVE MAINTENANCE PILOT AND MAIN BURNER If the main burners fail to exhibit they must be cleaned, either by blowing them off with compressed air or by washing Check pilot and main burners at least every 12 months for them in soap and water and rinsing. proper flame characteristics.
  • Page 11 Part Number for Models Nº Description WR400-1 K P 1 Front shell 8705421025 2 Water flow selector handle 8702000219 3 Water flow selector handle 8702000111 4 Washer 3/4" 8710103043 5 Draught diverter 8705505354 6 Heat exchanger 8705406235 7 Hot water pipe 8700705556 8 Cold water pipe 8700705294...
  • Page 13: Pour Votre Securite

    WR 400 1K… · Installation · Fonctionnement · Entretien Le chauffe-eau instantané BOSCH est la réponse pour haute éfficacité dans un espace restreint en satisfaisant tout vos besoin d’eau chaude. Tous les chauffes -eaux instantanés Bosch chauffent seulement la quantité d’eau sur demande sans dépenser de l’énergie pour maintenir la...
  • Page 14 Dimensions Figure 1 Pression maximum hydrostatique de l’eau - 1.03 MPa ( 150 lb / po ca.) Pression maximum d’opération recommander - 0.69 MPa (100 lb / po ca) Pression minimum d’opération - 0.0138 MPa (2.0 lb/po ca) at 2 L/min (0.5 U.S. gal/min) Modèle dimensions milimètres...
  • Page 15: Instruction D'installation

    AVERTISSEMENT AU LECTEUR Les caractéristiques des chauffe-eau à gaz instantanés de Le chauffe-eau à gaz instantané BOSCH est conçu de modèles WR400- 1 K sont conformes au normes CAN 1- sorte à pouvoir être adapté au propane ou au gaz naturel.
  • Page 16: Montage

    Soit un espace libre ou restreint dans un bâtiment de Au Etats-Unis construction étroite avec une infiltration insuffisante, l’air Le WR325 et le WR400 sont de conceptions certifié pour doit être tiré de l’extérieure ou d’espaces qui communique l’installation sur un mur de construction combustible (pour avec le plein air.
  • Page 17 Figure VENTILATION 1 et figure 5 ci-dessous. Les chauffes- eaux instantané BOSCH sont construit avec un directeur du tirage d’air et sont conçuent pour l’usage à l’intérieure seulement. Le directeur du tirage d’air doit être raccordé...
  • Page 18 ET C.G.A. Le chauffe-eau, y compris le régulateur de pression et le Les chauffes- eaux BOSCH sont expédier de l’usine avec robinet manuel fourni, ne doivent pas fonctionner à une pression de gaz au-dessus de 3.45 kPa (1/2 Lb/ Si il le régulateur de pression à...
  • Page 19: Instruction De Fonctionnement

    INSTRUCTION DE FONCTIONNEMENT AVERTISSEMENT INSTRUCTIONS D’ALLUMAGE Si le chauffe-eau était endommager ou exposer au feu ou à 1. ARRETEZ! Liser les informations de sécurité sur la la suie, ou que l’une de ces pièces était sous l’eau, ne pas plaque au-dessus utiliser.
  • Page 20 REGULATION DE TEMPERATURE et le brûler principal. Le modèle WR400-1 de BOSCH est muni d’un robinet de L’interruption de service attribuable à l’opération à haute gaz qui ajuste le débit d’eau de gaz au brûler principal en température montre que le chauffe-eau doit être vérifié...
  • Page 21 L’ENTRETIEN PREVENTIF TEMOIN ET BRULER PRINCIPAL S’y il faut laver le brûleur principale, suiveur les procédures Vérifier le témoin et les brûleurs principaux au moins à cha- suivantes : que 12 mois pour le bon fonctionnement de la flamme. 1. Fermer l’alimentation de gaz au chauffe-eau. Le témoin doit couvrir environ 10mm (3/8 pouce) sur le 2.
  • Page 23 Numéro de pièce pour les modèles Nº Description WR400-1 K P 1 Habillage 8705421025 2 Manette sèlecteur de débit eau 8702000219 3 Manette sèlecteur de débit eau 8702000111 4 Joint 3/4" 8710103043 5 Anti-refouleur 8705505354 6 Corps de chauffe 8705406235 7 Tube eau chaude 8700705556 8 Tube arrivée eau...
  • Page 24 BOSCH INSTANTANEOUS WATER HEATERS APPROVED FOR SPACE HEATING UNDER CLASS IV When using the Bosch Models W 125-K, W 400-K, WR 400-K, WR 400-1K and WRS 400-K for water heating and space heating the following requirements shall apply : All space heating equipment, piping and components connected to the heater shall be suitable for use with potable water.

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Wr400-1 k p