Meaning of Delta 50 (75/65/20)

Meaning of Delta 50 (75/65/20) 

Delta 50° (75/65/20) - with Delta T of 50°C, means 75°C inlet water temperature, 65°C outlet water temperature and 20°C of room temperature. The average water temperature in this example is 70°C (i.e. 75° plus 65°, divided by 2).  If we then take the 20°C room temperature we are left with a temperature differential of 50°C or Δt 50°.  


Add the flow water temperature and the return temperature together

Divide the answer by 2

Subtract the room temperature from the answer this gives you the Delta T temperature

Select the closest Delta T valve from the table and multiply the corresponding factor by the output provided for the particular radiator to obtain the output for your calculated Delta T valve.

If we then take into account the reduced inlet temperature eg you will be getting a heat source pump.
If we replace this with inlet water at 45°C inlet water temperature, 35°C outlet water temperature and 20°C of room temperature. The average water temperature in this example is 40°C (i.e. 45° plus 35°, divided by 2).  If we then take the 20°C room temperature we are left with a temperature differential of 20°C or Δt 20°.  
The conversion rate from T50 to T20 is 0.3039.
Eg a radiator 1800 x 500 has 795 Watts at Delta T50 x 0.3039 is 241 Watts (this is the T20 figure).
If we use another Heat Source Pump,  water temperature leaving our system will be 60 degrees returning at 50 and the Delta figure will be 35 degrees.
Eg at Delta 50 say the radiator has a BTU of 3,500.
To convert this to Delta 35 - 3,500 x 0.6290 is 2,202 
If we have the figure of at Delta 35 and we want to convert to Delta 50
2,202 / 0.6290 is 3,500 BTU
Btu Value T50 T50 to T35 (T50 x 0.6290) Equivalent T50 figure to give the required T35 is T50 / 0.6290
3776 2375 6003
3349 2106 5324
3780 2377 6009
5405 3399 8593
2368 1489 3764
4513 2838 7174
4009 2521 6373
5125 3223 8147
2755 1732 4379

When comparing products ensure you are being quoted Delta T 50°, furthermore look for the MARC logo (Manufacturers Association of Radiators and Convectors) and be sure to request the Declaration of Performance, conducted by an accredited body. 


A Delta T correction factor allows end-users and professionals to find out the actual output of a radiator or towel rail in the range of Delta T variations. The above calculator has been designed to efficiently calculate this based on input at Delta T 50°, alternatively, you can use the listed correction factors below, also based on Delta T 50°.

Example: Assuming a radiator or towel rail has a heat output of 1000 Watts at ΔT (Delta T) = 50°. At ΔT (Delta T) = 60°, the output would be 1000 x 1.27 (from the table above) equating to 1270 Watts. Alternatively, at ΔT (delta T) = 40°, the output would be 1000 x 0.75 equating to 750 Watts.

Read more →

Designer Towel Rails - IP Rating & Bathroom Zones


IEE Wiring Regulations have identified the following zones and IP ratings to ensure safety.

** Please CLICK on image below to enlarge **


In zones 1 and 2 if there is a likelihood of water jets being used for cleaning purposes a minimum of IPx5 is required.
Where ceiling heights exceed 2.25m, the zones are effectively up to 3m, beyond 3m the walls are out of scope.
Basins are not covered, however they are usually considered zone 2.

If the space underneath a bath cannot be accessed without tools that space is considered out of zone.
Information contained on this page is for guidance only. Please refer to current IEE Regulations or a qualified electrician.


The IP (ingress protection) rating given to an enclosure states the degree of protection of offers by means of two digits.
A summery of these are detailed below. For more information please see IEC 529: 1989 BSEN 65029:1992.

** Please CLICK on image below to enlarge **


  ** Please CLICK on image below to enlarge **



EC 529, bs en 60529 does not apply to any risk of explosion or conditions such as humidity, corrosive gases, fungi or vermin. In certain cases equipment designed to be mounted in an enclosure will contribute towards the stated IP rating (e.g. Push buttons mounted in an enclosure). Different parts of enclosures can have different degrees of protection and still conform to the standard (e.g. Enclosures with pre-drilled conduit entry). All information strictly for guidance only, please refer to regulations, a qualified electrician and manufacturers for information if you are in any doubt.


Read more →

MHS Blow Designer Radiator

Designed by French architect, inventor and designer Jean-Marie Massaud, this spectacular model has a breathtaking finish, which adds a sculptural quality and is unique to every Blow® Horizontal radiator. Thermostatic valves are included as standard.


Arranging the Blow® as a tall model offers a completely new perspective, while allowing it to be installed into rooms where wall space is at a premium. Like its horizontal cousin, every Blow® Vertical radiator is unique and is also supplied with thermostatic valves.

Read more →

Designer Radiator - Advantages of Aluminium Radiators

Most radiators sold in the UK are made of mild steel but over the last few years there has been an increase in designs made from stainless steel and aluminium.

The latter material is particularly interesting because it offers the potential for energy savings. The reason for this is that aluminium is more efficient at conducting heat, which is why is often used as a heat sink in everything from computers to large industry (the thermal conductivity of aluminium is 4-5 times that of mild steel).

Aluminium radiators transfer the heat from the water to the air in the room faster than steel radiators. This means that they require less heated water from the boiler and will be faster to respond to changes in the room heat requirement, hence reducing any wasted heat. As aluminium radiators are fairly new to the UK it is difficult to find quantifiable data about potential energy savings, especially as it will vary depending on location. However, some clever engineers we know estimate that using them could save 5-10% off your annual heating bill.

Bisque Blok radiator in Pure White 9010

Aluminium radiators also offer other environmentally friendly benefits. For one thing they are made of recycled material, so next time you recycle your drinks can, consider that it could end up as part of a new radiator. Also, because they have a lower water content, they can often be smaller than more traditional radiators. This can be useful when using them with low temperature heating systems, such as ground source heat pumps, because you do not need a large radiator to compensate for the lower water temperatures.

recycled aluminium

So why aren't all radiators made from aluminium? Well, aluminium is less strong and flexible than steel and is therefore manufactured in straight profiles. This means that there are limitations when it comes to radiator design - loops and bends are not possible.

One final and important point to note - when installing aluminium radiators on a heating system, it is always best to use a mixed system inhibitor, so make sure your plumber knows that you are using aluminium radiators.

Bisque Lissett radiator in white sable 



Steel is a very durable and high quality metal that is often used for radiators. One of the biggest benefits of using steel is that it does not rust over time. This is assuming that a high quality grade of steel is being used as poor quality steels may rust or wear over time. There are actually 150 different grades of steel so it is important to question what type of product you are getting when having a product installed.


Steel very easily conducts heat which makes a radiator made out of steel a very efficient option. Even when you turn off your central heating system, steel will retain its heat for a much longer amount of time than other materials so you will be reaping the benefits for some time after. This saves on energy costs.


The finish of steel is very attractive and it is also very simple to maintain by way of a quick wipe down every few months.

The Cost

Steel is not cheap at this point in time so expect to pay more for a steel radiator.



Aluminium has the ability to be a fantastic conductor. Aluminium has the ability to respond very quickly to a change in setting which gives you optimal control over the comfort level of your home or office.


Aluminium is able to emit heat very easily and efficiently. When you turn on a central heating system that has an aluminium radiator you can expect your home or office to warm up in a very short amount of time. Aluminum radiators require very little water content in order to heat a room which equates to lower monthly bills as well. Because of the lightweight quality of aluminum it is easier for a company to install. Installation fees may actually be lower because of this.


Aluminum is non-corrosive so you will find the quality is retained for many years.


Aluminium can be manipulated in a number of different ways in order to create all kinds of styles, finished and colours. It is really a very versatile material that works great for radiator construction.

There are both advantages of disadvantages to different radiator material options and there is a lot to think about when it comes to steel vs. aluminium radiators. Really the winner comes down to what a person wants from their radiator. Cost is usually a primary factor when it comes to having a radiator installed but depending on the location many people also pay close attention to the style of a unit. Not only will their installed radiators keep your home or office warm and cozy all year round but they are also aesthetically pleasing and will look great.


Read more →

MHS Radiators partners with Antrax

MHS Radiators partners with Antrax to launch exciting new collection

MHS Radiators has launched a spectacular collection of architecturally influenced radiators, following an exclusive long-term agreement with Antrax IT.

With an emphasis on cutting edge design, these magnificent radiators and towel rails have been crafted to make an impact, whether they are specified for a high-end residential property, or within a commercially-focussed environment.

Comprising 38 models in total, the collection includes 22 ‘Griffe’ radiators that have been developed in conjunction with internationally renowned designers and received worldwide acclaim, including Red Dot and Interior Innovation Design Awards. In addition, a selection of seven ‘Home’ radiators provide outstanding performance and style, while nine ‘Bath’ models are also available, offering elegant towel warmers in over 200 colours and high-quality chromium plate.

A standout model in the new collection is the Blade: a futuristic model inspired by nature that features elegantly curved surfaces and bevelled edges to effortlessly disguise powerful outputs. The vertical mounting also makes the Blade practical in rooms where space is at a premium, while a chrome towel bar ensures it is a great choice for bathrooms.

Commenting on the new products, Ian Bradley, Managing Director of MHS Radiators, said: “We’ve always been admirers of radiators that push the traditional boundaries of design, so partnering with Antrax IT is an exciting opportunity. The new collection allows us to offer retail and commercial customers incredible models that have been conceived with a completely fresh approach.

About Antrax IT

Situated just 40km from Venice, Antrax IT specialises in the manufacture of designer radiators and towel rails which offer superior levels of styling. The company started out as a family-run business in 1997, and focuses on using innovative materials and creating original shapes and products. Each radiator is functional but also highly attractive, becoming a part of an interior and blending in, or enhancing its intended surroundings.

Antrax IT has made quality its primary goal from the very outset, using cutting-edge production technology and internationally renowned designers, such as Daniel Libeskind and Peter Rankin.

MHS Radiators and Antrax IT have collaborated to launch a spectacular collection of architecturally influenced radiators, based on a shared vision of bringing cutting-edge designer radiators to the market. The two companies now offer a magnificent range of radiators and towel rails that have been crafted to make an impact, whether they are specified for a high-end residential property, or within a commercially-focussed environment.

Click here to link to all current Antrax IT Designer Radiators


Read more →