REU-KM2035FFUD-E Infinity K20i - Installation and User Manual

Oct 28, 2026

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Installation and user manual for Rinnai Infinity continuous flow water heaters, covering critical safety and compliance requirements before commissioning. Provides guidance for competent installers and qualified Gas Safe engineers, including responsibilities of the user, annual maintenance, and periodic checks such as the inlet water filter. Includes attention on safe air quality around the appliance, venting and corrosion risks from chemicals. Lists structured sections for operation, temperature controls, diagnostics, flue and condensate requirements, commissioning, wiring, and warranty information.

LanguageEnglish

CategoryTechnology

FormatPDF

Pages64

Reading Time2 h 41 min

AccessFree to download

Contents

User Instructions

Responsibilities of the USER

Important Information

Operation Without Remotes

Status Monitor

Temperature Controls

Error Messages

Restarting the Rinnai Water Heater

Caring for the Infinity

Installation Instructions

UK Installation Instructions

Unpacking Rinnai Water Heater

Operation

Main Components

Flue Requirements

Condensate Disposal

EZ Connect

Testing

Gas Pressure Setting

DIP Switch Setting

Dimensions

Technical Details

Product Fiche

Flow Chart

Wiring Diagram

Diagnostic Points

Water Flow Characteristics

Letter of Compliance

CE Certificate

Commissioning Checklist

Commissioning Sheet

Service Record

Maintenance

UK Warranty

Specification

Contact

Heater Details

| Installation and User
Manual
| | | --- | --- | | REU-KM2035FFUD-E Infinity K20i REU-KM3237FFUD-E Infinity K32i REU-KM3237WD-E Infinity K32e
REU-KM3237FFUDHD-E Infinity HDC 1500i
REU-KM3237WDHD-E
Infinity HDC 1500e | REU-KM2035FFUDHD-E Infinity HDC1000i REU-KM2635FFUD-E Infinity K26i REU-KM2635WD-E Infinity K26e
REU-KM2635FFUDHD-E Infinity HDC 1200i
REU-KM2635WDHD-E
Infinity HDC 1200e | | Continuous Flow Water Heater
Important.
Read these instructions carefully before attempting installation or use of this appliance. All work must be carried out by competent persons. | | | The Rinnai Infinity range of water heaters, when correctly installed, comply with the requirements of the United Kingdom Water Regulations / Byelaws (Scotland) . These Products can be found listed in the Water Fittings and Materials Directory. | | | --- | --- | | The Rinnai Infinity condensing water heaters are CE Marked as allowed by Technigas.
Infinity K32 & HDC1500
Infinity K26 & HDC1200
Infinity K20 & HDC1000
Certificate numbers: E1188/5560-Rev.3
ID number: 0461BU0950
Date of Issue: 01/09/2009
Last revision: 28/05/2015
Certificate numbers: E1189/5560-Rev.1
ID number: 0461BU0950
Date of Issue: 01/09/2009
Last revision: 02/02/2010
| | | Quality System Standard | | | ISO 9001-2008
The Design, Development, and Manufacture of Gas Water Heating Appliances done under Rinnai’s Quality Management System is certified under the Quality Management System Standard ISO 9001.
Registration Number JQ0003D Registered since: February 1994 Certified by JIA—QA Centre. | | CONTENTS CONTENTS 3 USER INSTRUCTIONS 4 FEATURES AND BENEFITS 5 IMPORTANT INFORMATION 6 OPERATION WITHOUT REMOTES 8 STATUS MONITOR 8 TEMPERATURE CONTROLS 9 ERROR MESSAGES 14 RESTARTING THE RINNAI WATER HEATER 16 CARING FOR THE INFINITY 16 INSTALLATION INSTRUCTIONS 17 UK INSTALLATION INSTRUCTIONS 18 UNPACKING RINNAI WATER HEATER 19 OPERATION 20 MAIN COMPONENTS 23 INSTALLATION INSTRUCTIONS 24 FLUE REQUIREMENTS 28 CONDENSATE DISPOSAL 32 TEMPERATURE CONTROLS 34 EZ CONNECT 36 TESTING 37 GAS PRESSURE SETTING 38 DIP SWITCH SETTING 40 DIMENSIONS 42 TECHNICAL DETAILS 44 PRODUCT FICHE 46 FLOW CHART 49 WIRING DIAGRAM 50 DIAGNOSTIC POINTS 52 WATER FLOW CHARACTERISTICS 53 LETTER OF COMPLIANCE 54 CE CERTIFICATE 55 COMMISSIONING CHECKLIST 57 COMMISSIONING SHEET 58 SERVICE RECORD 59 MAINTENANCE 60 UK WARRANTY 61 SPECIFICATION 63 CONTACT 64 HEATER DETAILS 64 USERS INSTRUCTIONS The following instructions are designed for the user of the water heater. The user may not install or adjust the appliance in any way that requires the removal of the front cover of the unit. To remove the front cover of the unit you must be certified competent to do so. Information for the Installer is given from page 17. All work done on this appliance must be done by a qualified gas engineer. A qualified gas engineer must carry an up to date Gas Safe Registered Gas Installer photo identification card while working on gas appliances. If you are unsure do not be afraid to ask the engineer to show you the card. If you are still not satisfied call Gas Safe on 0800 408 5500 and verify the engineer’s name with their database. This is foryour own safety. Responsibilities of the USER The user must abide by all warnings given in this book. The user must only reference the user section of the book, and may not carry out any procedure listed in the installer section. This installation manual should be kept with the appliance for maintenance and user information. The user must have the unit checked and maintained annually by a gas engineer. The user must periodically check the water filter on the inlet to the appliance. The user must not use the appliance in any way that it was not meant to be used. The user may only use the heater as detailed in the User portion of this manu

FAQs

Who is allowed to install and work on the Rinnai Infinity water heater?

Installation and all work on the appliance must be carried out by competent persons, specifically a qualified gas engineer. The installer must hold an up-to-date Gas Safe Registered Gas Installer identification card.

What responsibilities does the user have after installation?

The user must follow all warnings in the book, only reference the user section, and must not perform procedures listed in the installer section. The unit should be checked and maintained annually by a gas engineer, and the inlet water filter should be periodically checked.

Why does the manual warn about air around the water heater and corrosive chemicals?

Air surrounding the water heater, venting, and vent termination(s) is used for combustion and must be free of compounds that cause corrosion. This includes corrosive chemicals found in aerosol sprays, detergents, bleaches, cleaning solvents, oil-based paints/varnishes, and refrigerants.

Oct 28, 2026

Upload by awa