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Residential Pendant Fire Sprinkler Heads – How do they Work?


Two types of pendant fire sprinkler heads are currently available and work in different ways:

  • Concealed residential pendant fire sprinkler heads.
  • Traditional pendant design fire sprinkler heads.

Concealed fire sprinkler heads are becoming more popular in, and appropriate for, residential settings.

Comparing Pendant Sprinkler Heads

These two types of fire sprinkler heads differ in a number of ways:

  • How the residential pendant fire sprinkler heads work.
  • How the residential pendant fire sprinkler heads are designed.
  • How the residential pendant fire sprinkler heads are placed and their visibility.

How Do Pendant Fire Sprinkler Heads Work?

Concealed Residential Fire Sprinkler Heads

concealed sprinkler heads.

Concealed residential pendant fire sprinkler head

Concealed residential fire sprinkler heads are designated as ‘quick response’ heads since the sprinkler system activates at an early stage of a fire’s growth. They are a two-stage mechanism, as opposed to the pendant design.

When a fire reaches its working point, the flat cover ceiling plate falls from the device, allowing the sprinkler head’s deflector plate to drop below the ceiling level. When the temperature at the ceiling reaches 74 degrees Celsius, a bi-metal strip activates and releases the seal, allowing the full flow of water to be directed towards the fire.

Each fire sprinkler head is operated separately, increasing the pressure, flow, and delivery of water to the fire while minimising water damage to non-affected regions.


pendant sprinkler head

Exposed residential fire sprinkler head

Traditional Pendant Fire Sprinkler Heads

Unlike concealed residential fire sprinkler heads, standard pendant design heads are single-stage devices that project below the level of the ceiling when activated, allowing water to stream horizontally.


Individual sprinkler heads only work when they are heated to their pre-set activation temperature by hot fire gases. Fire sprinkler heads outside the immediate area of the fire do not open, so water is not sprayed onto non-alight areas, minimising the amount of water utilised and water-related damage while increasing available water pressure.

The activation technique and make-up of pendant design fire sprinkler heads, such as that depicted in Figure 2, differ significantly from that stated for residential concealed fire sprinkler heads. Every sprinkler head in the system is kept closed by a glass, heat-sensitive, liquid-filled bulb that acts as a plug, preventing water from flowing back into the supply pipes. The bulb breaks when the liquid within heats up and expands when the temperature around the sprinkler head reaches the specified activation level. Because the bulb can no longer operate as a ‘plug,’ water can enter the sprinkler head and extinguish the fire.

Design of Pendant Sprinkler Heads:

Concealed Residential Fire Sprinkler Heads

Contrary to pendant fire sprinkler heads, concealed residential fire sprinkler heads are intended to be aesthetically beautiful as well as functional. The sprinkler head, which is about the size of a downlight, is hidden in the ceiling void by a flat cover plate that lies flush with the ceiling. Typically, these cover plates are white.

Traditional Pendant Fire Sprinkler Heads

Pendant fire sprinkler heads are a traditional style that is commonly utilised in commercial buildings. While effective, these sprinkler heads are installed below the ceiling and add little to the aesthetic value of their surroundings.

Placement and Visibility:

Concealed Residential Fire Sprinkler Heads
Concealed residential fire sprinkler heads are not visible while not in operation, unlike pendant fire sprinkler heads.

Traditional Pendant Fire Sprinkler Heads

Traditional pendant fire sprinkler heads are not disguised and project below the level of the ceiling, remaining in full view at all times.

Choosing A Residential Pendant Fire Sprinkler Head

Traditional pendant fire sprinkler systems, which were rarely recognised for their aesthetic value, have now been mostly replaced with concealed residential fire sprinklers, which not only integrate with but enhance the space they’re built and installed to protect.

Why Should I Choose Concealed Sprinkler Heads?

Concealed sprinkler heads are becoming a more popular option among our customers. The system will be barely detectable with a disguised sprinkler head, yet it will be just as effective as a typical pendant system. The ability to conceal the system means that the features of your structure have been ruined. Some of the reasons we believe you should use disguised sprinkler heads are as follows:

  • Blends in with surroundings
  • Design is discreet and suits any style of property
  • Fast response time
  • Suitable for all types of buildings
  • Limited water damage

Please contact us for additional information on the concealed sprinkler head systems we provide. Alternatively, you can visit our website to learn more about the products and services we provide.

Contact RAD Fire Sprinklers For Concealed Sprinkler Systems

If you want a concealed sprinkler system installed, don’t hesitate to call RAD Fire Sprinklers. We have a team of designers and engineers that will work with you to ensure that your concealed system fits the style of the home as well as the requirements. We guarantee a high degree of finish because all work is done by skilled engineers. We have something for every type of property with our selection of disguised fire sprinkler systems. When it comes to concealed systems, make sure to contact RAD Fire Sprinklers.

Frequently Asked Questions About Residential Sprinkler Heads

Will People be able to See the Sprinkler System?

No. Sprinkler systems that are concealed are meant to merge seamlessly into the roof or ceiling space. We believe in collaborating closely with our customers to ensure they select the appropriate sort of system for their property and needs.

Aren’t Sprinklers Ugly?

Not any longer. Fire suppression systems have gotten considerably more elegant in

Will You Design the Concealed Sprinkler System for Me?

Yes! You will work closely with our engineers if you choose RAD Fire Sprinklers for our concealed fire suppression systems. We’ll build a hidden design that complements the style of your home.

Why Should I Choose a Concealed Over a Traditional System?

Concealed systems provide all of the benefits of a standard system, plus more. With a disguised fire sprinkler system, you can keep your property and the people on it safe without sacrificing the property’s appearance.

How Much Does it Cost to Have Concealed Sprinklers Installed?

The cost of a concealed sprinkler system is determined by several factors, including the system’s size and the amount of structural work required to install it. We provide high-quality systems at reasonable pricing. Contact RAD Fire Sprinklers today for a quote.

Find out how automatic sprinklers work here on our blog page.

Mist system was a great solution for our renovation needs and them team at RAD have been great. Always communicated clearly and been on hand to discuss over the phone as needed. Would highly recommend!
09:32 17 Jul 22
I have used RAD for a couple of projects and found them to be good to deal with. They did a pair of 3 storey open plan houses and seven three and four story town houses. The sprinklers were to improve fire safety, allow more flexible space and comply with building regulations. The sprinklers were far more cost effective than the mist type systems and look very discrete when installed.
Paul Jeary
15:50 11 Jul 22
It has been a pleasure to deal with RAD for installation of fire sprinklers at our site is Sevenoaks. They were fast, professional, working to time and quote, which made it easy to work with them.
Katrina Horobin
12:03 29 Jun 22
My requirement was a bit unusual for RAD in that I wanted a mist system in one room of a rented house. I had no drawings or technical back up. RAD were very helpful and repositioned the unit after the initial installation. Luckily with the help of Sonny, the engineer it all worked out very well.
Simon Gurney
16:16 12 May 22
I have used RAD for the last 10 years for all of my housing developments in need of a sprinkler system. Easy process from start to finish and no issues or problems throughout. Always someone at hand to answer a querie and we have a great working relationship with the team at RAD. Would highly recommend.
15:33 12 May 22
Diligent & a very professional team. A joy to deal with. Will certainly be calling on them to help with many more future schemes.
Jason Tema
22:17 08 Jul 19
Great team, fitting sprinklers, saving lives & property... What more could you wish for!!!
Colin P
17:53 01 Jul 17
Excellent company & great service... This company rocks! They sprinkle fires & save lives!!!
Music N Videoz
07:15 16 Dec 16
As somebody who feels that it should be a necessity for all properties to have fire sprinkler systems, I am a big fan of this company. I have used them numerous times to service my home system and they are very knowledgeable. I would highly recommend their service.
Kate Fraser
09:25 30 Mar 15
One look at Rad Fire Sprinkler's website will tell you that these guys know exactly what they are talking about when it comes to Fire Sprinklers and the legislation surrounding fire safety. A very trustworthy company.
Adam Hudson
16:45 15 Nov 13

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58A St John’s Road
Tunbridge Wells, TN4 9NY

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