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concealed fire sprinkler heads

What Are the Differences Between Pendant and Concealed Fire Sprinkler Heads?

So, you’ve decided to install a fire sprinkler system… it’s about time! Now, what system are you going to choose? The typical pendant head or concealed fire sprinkler heads?


Both have their advantages. Both save lives and property damage. It all just depends on your preferences and how you want your sprinkler system to look. Find out more below. 

Pendant Sprinkler Heads

The activation mechanism and construction of sprinkler heads in pendant sprinkler systems are fundamentally different from those in concealed fire sprinkler systems.


In these systems, each sprinkler head is kept closed by a glass, heat-sensitive, liquid-filled bulb, which serves as a “plug”. When a temperature over 56°C is discovered, the bulb breaks and the liquid inside heats and expands. This then releases the water and douses the fire to suppress the flames.

Concealed Fire Sprinkler Heads

You might not even realise a building has sprinklers in place with this type of system. Concealed fire sprinkler heads are designed to have an understated, sleek and contemporary look that fits in with all types of aesthetics. 


When installed on a white ceiling, they have a modern white look and blend nicely with the decor. That is why they are helpful to architects and designers throughout the design stages. Find out more about how sprinklers can benefit both architects and developers here. 

How Do Concealed Fire Sprinkler Heads Work?

In the event of a fire, where heat of over 56°C is detected, concealed sprinkler heads work in a different manner. The cover plate, which is typically soldered to the support cup in three positions, separates from the sprinkler assembly, exposing the mechanics.


The deflector now lowers to its operational position, supported by the arms. In the event that the temperature rises further, the concealed fire sprinkler heads are now prepared to activate.

What Sprinkler Head Should I Use?

This all depends on the specific requirements of the building and functionality. For example, primarily in residential properties, concealed fire sprinkler systems may be considered. This is because they hide the protruding mechanics, unlike pendant sprinkler heads which are obvious to occupants. Within homes and other buildings such as care homes, this might be preferred as they do not obtrude the aesthetic and blend in with the space.


So, in commercial buildings, such as warehouses and restaurants, it may be important to ensure occupants that there are sprinkler systems in place. Especially in hazardous areas. Also, though concealed heads are fast-acting, they require a two-stage activation. Whereas pendant sprinkler heads simply activate once high temperatures are detected.


Whatever your preference, it is important that fire sprinkler systems are installed in all types of buildings, including residential and commercial. Find a reputable installation company that can guide you through the different types and which one is more suited to your needs.

RAD Fire Sprinklers

Here at RAD, we are an experienced fire sprinkler company that has installed and retrofitted sprinklers within both residential and commercial buildings. Based in London and the South East, our team can fit pendant and concealed fire sprinkler heads within properties, depending on the specific requirements. 


For more information, or to receive a quote, fill in our form here. Or, give us a call on 01892 680 090.

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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RAD Fire Sprinklers Ltd.
58A St John’s Road
Tunbridge Wells, TN4 9NY

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Tel: 01892 680 090

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