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Installation and Operating Instructions (version 3.3)
The IWH-1.5E instantaneous water heater is designed according BS EN 1949:2011 +
A1:2013 "Specification for the installation of LPG systems for habitation purposes in leisure
accommodation vehicles and accommodation purposes in other vehicles". This water heater
is not for use in space heating or marine application.
WARNING: If the information in these instructions is not followed exactly,
a fire or explosion may result causing property damage, personal injury or loss of life.
Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this
or any other appliance. WHAT TO DO IF YOU SMELL GAS
Evacuate all persons from the vehicle.
Shut off the gas supply at the gas container or source.
Do not touch any electrical switch, or use any phone or radio in the vehicle.
Do not start the vehicle's engine or electric generator.
Contact the nearest gas supplier or qualified service technician for repairs.
If you cannot reach a gas supplier or qualified service technician, contact the
nearest fire department
Do not turn on the gas supply until the gas leak(s) has been repaired.
Installation and service must be performed by a qualified installer, service
agency, OEM or the gas supplier.
If you want an additional safety, we recommend an additional extern tempering valve, which
restricts the water temperature to 50°C.
For most applications it is not necessary. Only if you slow down the water flow under 2l/min
very quick, the cold water has already temperatures over 20-25°C and you are not using any
mixing tab, the temperature might rise over 60°C for a short time (<1 min).
● Install in recreation vehicles only. RV's are recreation vehicles designed as temporary
living quarters for recreation, camping, or travel use having their own power or towed by
another vehicle.
● All combustion air must be supplied from outside the RV, and all products of combustion
must be vented to outside the RV.
● DO NOT vent water heater with venting system serving another appliance.
● DO NOT vent water heater to an outside enclosed porch area.
● Protect building materials from flue gas exhaust.
● Install water heater on an exterior wall, with access door opening to outdoors.
● DO NOT modify water heater in any way.
● DO NOT alter water heater for a positive grounding system.
GmbH – IWH-1.5E
Instantaneous Gas Water Heater
Critical Installation Warnings
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Summary of Contents for IMASS IWH-1.5E
- Page 1 Instantaneous Gas Water Heater Installation and Operating Instructions (version 3.3) The IWH-1.5E instantaneous water heater is designed according BS EN 1949:2011 + A1:2013 “Specification for the installation of LPG systems for habitation purposes in leisure accommodation vehicles and accommodation purposes in other vehicles”. This water heater is not for use in space heating or marine application.
- Page 2 Ventilation must comply with relevant national and/or local requirements. Installation Instructions for the IWH-1.5E Water Heater The IWH-1.5E water heater is designed to be installable and removable from the exterior of the vehicle. The mounting instructions are for the PrecisionTemp surface mount door. No other door should be used.
- Page 3 Cut a rectangular hole with a width of 33 cm and a height of 33cm at the selected position. Push the IWH-1.5E into the opening. Center the heater in the opening and start a screw in the top center hole.
- Page 4 Connection Gas Supply Connect an approved gas line with 8 mm diameter to the gas inlet using an olive connection. The olives have to be selected according to the gas supply pipe used. The brass olive, which is delivered with the unit, is only for the usage with 8 mm copper gas pipes. Before connecting the gas pipe, please ensure that the gas line is free of dirt and swarf.
- Page 5 The cold water inlet and the hot water outlet are connected via 2 standard ½” male fitting. Use a rubber seal or other removable sealants. Piping and components connected to the heater shall be suitable for use with potable water. If you us a water pressure regulator, the output pressure should be between 0.5 and 4.5 bar and the minimum water flow should be higher than 3.3 l/min.
- Page 6 The water heater is designed for 12 VDC (10.5 …15V, negative ground). The power leads are on the back of the heater and should be connected via a breaking switch to the 12 V system of the RV. The white wire is positive (+) and the black wire is negative (see sticker). A breaking switch is recommended for safety reasons, so the water heater could be switched of separately.
- Page 7 Operating Instructions and first operation test Note to installer: You must test the operation of this appliance after installation. Pressurize the water system by turning on pump or city water pressure. Purge all air from system by turning on the taps until a steady stream of water flows from the taps.
- Page 8 Trouble shooting The IWH-1.5E is equipped with a µ-processor based self-diagnostic system. A possible error is shown in the LED display of the remote control. Failure code shown in the display No flame detection during operation and re-ignition failure within 10 sec Pilot flame doesn’t light up after 10 sec.
- Page 9 (less than 2 bar) to purge the system of all water. Recommendations of your coach manufacturer should be followed. Since the IWH-1.5E has no storage tank, there is no need for a water heater bypass kit. It holds less than 0.3 l of anti-freeze.
- Page 10 Specifications Countries of Destination: AT, BE, BG, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HU, HR, IE, IS, IT, LT, LU, LV, MT, NL, NO, PL, PT, RO, SE, SI., SK CAT I3B/P (30) Gas pressure butane G30/ propane G31 (mbar) Classification of Heater Type: C12 (Fanned) Flue diameter in mm ID...
- Page 11 Who to Contact For service and spares, please contact your selling agent:...
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Questions and answers
Good evening,our water heater starts straight away to give warm water in the shower. If one person gets out and another person gets in the water is cold with error E1. Can you please help
Error E1 on the IMASS IWH-1.5E water heater means that the pilot flame does not light up after 10 seconds. To resolve this issue, ensure that the gas supply is turned on, check for any obstructions in the gas line, and verify that the ignition system is functioning properly. If the issue persists, contact a qualified service technician.
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