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The HF500 flammable gas alarms from Honeywell have been specifically designed to meet the needs of a wide variety of users; from home owners to social housing landlords and owners of static holiday homes. With a combination of performance, affordability and ease of installation, the HF500 is able to provide up to five years of flammable gas monitoring.


• Hard-wired for peace of mind

Easy to operate

• Clearly visible status indication LEDs; power, alarm, fault

• Loud 85dB alarm and button for test and alarm mute

High reliability

• Approved to EN50194-1:2009 by BSI (Kitemarked KM 590203)

• State-of-the-art catalytic sensor technology

• Professional design

Low total cost of ownership

• Optimised for easy wiring and installation

• Direct connection to a solenoid valve

• 5 year product life with 2 year guarantee

Designed for residential environments

• Small, compact design optimised for residential settings

Easy to install

• Easy to access wiring terminal

• Cable entry from the back or via mini trunking from the sides or bottom of the device

• Fits to standard electrical installation boxes

• Design allows alarm to be replaced without rewiring

• Installer mode to test the functionality of the relays

A complete solution

• Integrated alarm relay can operate normally open and normally closed solenoid valves for automatic gas shut off

• Alarm and fault relays can also be used to connect to a control panel/alarm system

• Honeywell also offers a wide range of suitable solenoid valves


This mains powered Flammable Gas Alarm must be installed by a competent person qualified to carry out electrical work according to current national wiring regulations. Please download the manual above for further information

Technical Specifications



Detection Principle

Catalytic flammable gas sensor

Third Party Approvals

EN50194-1:2009 Kitemarked (KM 590203)

Other Compliances


Self Test


Lifetime And Warranty

5y / 2y

Operating Environment


Operating Temperature Range

-10ºC to +55ºC


0-95% RH (non-condensing)

Ip Rating


Electrical and Interconnection


Operating Voltage

110-230VAC 50/60Hz

Power Consumption


Relay Output Fitted

Alarm relay: 5A 250VAC SPDT (single pole changeover), Faukt relay: 0.25A 250VAC SPST NO (single pole)

User Interface


Visual Indicator

Power: Green LED, Alarm: Red LED, Fault: Yellow LED


>85dB @ 1 m


For test and alarm mute, Installer test mode for relays

Test Facility

Calibration level: 10% LEL, Accuracy tolerance: +/- 2.5% LEL



Models Available

Methane for HF500NG, Butane for HF500LPG


<400 g


150 x 104 x 37 mm



Packaging Type

Carton box

Scope Of Supply

HF500 alarm Mounting kit: Scews and plugs, User and installer manual