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10 Year Longlife Battery Heat Alarm - Ei603

Discontinued Product

This product has been discontinued.

Product Overview

The Ei603 heat alarm detects fire by sensing the rise in temperature of its surroundings rather than sampling the air, and its sealed 10 year lithium battery means the alarm will continue to provide continuous detection without the need to regularly replace its batteries. By detecting heat instead of smoke the Ei603 will not suffer nuisance alarms caused by large amounts of dust, cooking fumes, and steam as traditional smoke alarms would, making this alarm suitable for the loft, kitchen, or garage.

  • Battery: Built-in lithium battery
  • Warranty: 5 year warranty
  • Red LED status indicator – flashes every 40 seconds during normal operation
  • Simple twist-on base design for easy installation
  • Screw fixings supplied, optional adhesive pad can be added before checkout
  • Suitable for installations complying to BS 5839-6: 2019 Grade F1
  • Self-test performed every 16 seconds
  • CE Marked and Kitemarked to BS 5446-2: 2003
Technical Data
Product Code EI603
Alternative Product Codes EI603, Ei603, Ei603C, Ei603C-D, Ei603TYC, Ei603TYC-D
Brand EI Electronics
Battery Type

10 Year Sealed Lithium

Dimensions (HxDia)


Operating Temperature

Operating: 0°C to +40°C

Storage: 0°C to +35°C

Relative Humidity

15% to 95%

Sound Output



5 Years

Weight 0.20kg
Product Datasheets
FAQs (4)
Q. Would the Ei600 series be suitable for installation in flats? The system needs to be grade A or grade D.

The Ei600 series does not conform to grades A & D, it conforms to grade F, relating to battery operated interlinking smoke detection. Both grade A and grade D systems relate to mains powered interlinking alarm systems. The alarms that would be suitable for your application are the Ei140 series and the Kidde Firex.

Q. What sort of smoke alarm system would I need to install for a HMO?

BS 5839-6 recommends that one or two storey HMOs with an individual floor area of no more than 200sqm (not the total of both floors) should have a Grade D smoke alarm system installed. Grade D refers to mains powered smoke alarms with a back up battery power supply. The alarms can be interlinked either by wire or by radio signal and the system does not require a separate fire alarm panel. For HMOs of 3 storey or higher, a Grade A panel system would need to be installed. This can cover the whole of the building, or can be used just for the communal areas with a separate Grade D system installed for the individual dwellings. For both applications, the level of cover should be a minimum of LD3 (in all escape routes) but this may change according to the fire risk assessment.

Q. Do the Ei600 series alarms need 230v or do they just use battery?

The Ei600 series of radio-interlinked alarms are completely battery operated. This means that they do not need to be wired up to the mains circuit. On the website, we offer the Ei600 series with a standard 9v battery or with a 10 year lithium longlife battery. The standard 9V batteries last approximately 12-18 months depending on how often the detectors are tested. The lithium battery units are sealed and last 10 years i.e. the full lifespan of the detector.

Q. Can a smoke alarm be fitted with a sticky adhesive pad in a let property?

The sticky pad is suitable for all battery operated smoke alarms. However, we cannot judge if battery alarms are suitable for your let property, as let properties usually require mains powered alarms. There is some advice to this in the governments guides to fire risk assessments. Also see the LACoRS guide for let properties.

Looking for more information?

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