Why do chrome radiators have a lower heat output?

Radiators and heated towel rails are available in an increasing range of designs and finishes but radiator specialists are regularly asked the question: “Why do chrome radiators have a lower heat output than painted radiators?”

Radiators are now available in a huge range of models including contemporary, designer and traditional styles with each coming in its own range of finishes, from the whitest whites to outrageous oranges and gleaming chrome.   Customers demand not just comfort but a stylish product to add to their interior décor, therefore heat output as well as design and finish are all critical when it comes to choosing a radiator. 

However, when it comes to heat outputs, customers can find it all rather confusing.  One reason is that the heat output of a radiator can vary depending on purely the finish. 

For example, Feature Radiators’ D-Line contemporary style radiator, comes in white, black or chrome.  You would think that in the same size, they would all give the same heat output, but this is not the case.  Instead the white and black models give out 20% more heat output than the chrome version.  Chrome radiators will always give out less heat (up to 30% less) than a painted equivalent. 

So why do chrome radiators give out less heat than painted radiators?

There are 3 key reasons why chrome radiators are not able to radiate as much heat out:

1. Firstly, this is down to the scientific phenomenon known as “surface emissivity”. Chrome has a low emissivity value; this means that chrome tends to trap heat and it is difficult for it to emit or radiate heat.  This explains why the seatbelt buckle in your car gets so hot on a sunny day.  Although this may not make them ideal for “radiators”, chrome does provide an excellent material for drying towels on. 
2. Chrome is coating applied on top of another metal, usually mild steel or brass.  This means that the heat has to penetrate through 2 layers of metal; and
3. Chrome is as shiny on the inside as it is on the outside meaning it reflects heat back in on itself reducing the amount it can radiate; it has an effect similar to the space blankets you see wrapped around long distance athletes after a race.

10 years ago, a chromium or chrome finish was the latest thing when it came to radiators, but increasingly there is a movement away from chrome because of the lesser heat outputs.  Now customers often opt for a polished stainless steel finish instead as this alternative option is very similar in appearance to chrome but, as it is bare metal rather than a coating, it performs better as a “radiator”. 

There is also some difference in emissivity between not just finishes but also even colours.  However the industry has agreed that this difference is negligible in practice and advertising heat outputs for every shade would overcomplicate the decision for the consumer.   Also manufacturers would require highly accurate, sophisticated and, consequently, expensive measuring apparatus to quantify the difference adding unnecessary costs onto the price of the radiators.  Therefore radiators finished in white and other “painted” or powder coated finishes are always advertised as the same. 

Bear in mind that retailers also may advertise the same products in the same finish with different heat outputs due to the variation in measuring standards used in Britain versus Europe.  For more information on variations in heat outputs see our article “Different companies sometimes state different heat outputs for the same radiators, why?”

For expert advice on choosing a radiator with the appropriate heat output for your space then contact a radiator specialist such as Feature Radiators.  For face-to-face advice and to see over 250 display models then visit their showroom at The Old Post Office, 134-140 Main Street, Bingley, West Yorkshire. BD16 2HL or call them on 01274 567789 or browse their products at www.featureradiators.co.uk.

Different companies sometimes state different heat outputs for the same radiators, why?

Calculating your heat output requirement from a radiator and finding the appropriate size of radiator can be confusing. 

For example:

You provide your room measurements and your radiator specialist, Joe Bloggs Radiators, recommends that you need 1200 Watts heat output from your radiator.  Consequently they recommend a radiator that meets your requirements; X radiator in white, 600mm high x 1000mm wide, which gives out 1264 Watts. 

However, your plumber tells you that the same radiator, X radiator in white, 600mm high x 1000mm wide but from his supplier, ACME Radiators, only gives out 1000 Watts.  How can this be? 

The answer is probably that Joe Bloggs Radiators are advertising their heat outputs at the British standard whereas ACME Radiators are advertising their heat outputs using the newer European standard. 

To explain, heat outputs can be measured in 2 different ways; the way they are measured is done against the “delta T” or “Δt” of the system. 

In the UK, the standard for calculating heat outputs is illustrated by the following example:

• Flow water temperature (on entering the radiator) – assumed to be at 90˚C
• Return water temperature (on exiting the radiator) – assumed to be at 70˚C
• This means the average water temperature running through the system is assumed to be   80 ˚C
• From this figure, you minus the average room temperature – assumed to be 20 ˚C
• This equates to the Δt60 ˚C standard.

In Europe, the standard for calculating heat outputs is illustrated by the following example:

• Flow water temperature (on entering the radiator) – assumed to be at 75˚C
• Return water temperature (on exiting the radiator) – assumed to be at 65˚C
• This means the average water temperature running through the system is assumed to be   70 ˚C
• From this figure, you minus the average room temperature – assumed to be 20 ˚C
• This equates to the Δt50 ˚C standard.

To be clear, there is no difference in the radiator, it is just a different way of recording the performance and heat output.  Like metric versus imperial; the numbers may be different, but they mean the same thing. 

The reason that retailers still often use the original British Δt60 ˚C is because most domestic plumbers and heating engineers still calculate heat requirements to this standard.  Although most manufacturers now using the European standard of Δt50 ˚C.

The important thing is to compare like with like.  Check whether your heat output requirement has been calculated at the Δt60 ˚C or Δt50 ˚C standard then match the radiator output using the same standard.

It is easy to convert a Δt50 ˚C heat output to a Δt60 ˚C heat output and vice versa:

• To convert Δt50 ˚C to Δt60 ˚C, multiply Δt50 ˚C heat output by 1.264.
• To convert Δt60 ˚C to Δt50 ˚C, divide Δt60 ˚C heat output by 1.264.

So in conclusion, when buying a radiator, make sure you are comparing like with like; check the testing standards used and convert the figures as necessary or, to save yourself time and hassle, contact a reputable radiator expert who can do all this for you.

For more information on radiator heat outputs and expert advice on choosing a radiator with the appropriate heat output for your space then contact a radiator specialist such as Feature Radiators.  For face-to-face advice and to see over 250 display models then visit their showroom at The Old Post Office, 134-140 Main Street, Bingley, West Yorkshire, BD16 2HL, call them on 01274 567789 or browse their products at www.featureradiators.co.uk.

Celebrate independent merchants on 4th July

Saturday is the 4th July and, in the UK, it's “Independents Day” (rather than Independence Day), a day to celebrate our nation’s independent merchants and the unique products and services they offer. So remember on Saturday, if you have shopping to do, take the time to consider buying from an independent and do your bit to mark the day.




In the USA, the Fourth of July is Independence Day, however
in Great Britain, the Fourth of July is “Independents Day”, a day to celebrate our
nation’s independent merchants and the unique products and services they offer.

When
it comes to finding products for the home, shoppers are increasingly opting for
independent merchants over the larger chain stores known for generic products
and lack of personal service.   

The benefits of buying from an independent merchant are
numerous and include:

1. Genuine
   specialists of particular products, with extensive product knowledge and
   expertise, helping you make the right choice for your particular situation
   and needs;
2. Such
   specialist independents, have the ability to offer bespoke and/or unique
   products that you won’t see anywhere else in the country;
3. The
   encouragement of diversity on our high streets;
4. No
   annoying automated phone service or call centres; phones are answered by
   human beings and you can usually speak to the same person saving you time;
5. No
   intermediaries; meaning you can speak directly to the relevant person,
   saving time and potential confusion;
6. No
   rigid rules and standardised systems; independents can often tailor their
   service to suit your individual needs.

When
it comes to specialised niche products, such as larger interior products for
the home, the relevant showroom will often be a destination in its own
right.  Put simply, it’s worth travelling
to see a comprehensive range of a particular type of product “in the flesh” and
under one roof, particularly if there is also expert advice on offer.  The savings of time and cost can be
phenomenal, and the end products are more likely to right for your particular
needs and design ideals. Such specialist showrooms will rarely be located in
the city centre because they don’t need to be. 
Such specialist independents don’t generally rely on passing trade, and
need relatively substantial square footage to display their product range.  

A perfect example of the award winning business,
Feature Radiators, the UK’s leading radiator retailer and an independent
merchant that operates successfully from the small West Yorkshire town of
Bingley. 

Based in the Victorian setting of Bingley’s
old post sorting office, Feature Radiators is a one-stop port of call for
anyone wanting stylish, high performance heating at competitive prices.  This award winning company offers a selection of the best contemporary, designer, traditional cast iron and electric radiators and heated towel rails on the market in terms of quality, design and value for money.  They have approximately 250 styles on display
in their showroom from where they offer expert advice, unrivalled customer service and
nationwide delivery. 

So on
the 4^th July, if you have shopping to do, whether it be a bottle of
wine, a picture frame or a household radiator, take the time to consider buying
from an independent and do your bit to mark the day.

For more
information on Feature Radiators specifically, then visit their showroom
at The Old Post Office, 134-140 Main Street, Bingley, BD16 2HL, call their
expert team on 01274 567789 or browse their website http://www.featureradiators.co.uk