Rated as excellent
By 100s of our customers
Customer Reviews
At Element Shop we use an independent third party review service to collect our customer feedback. This review service is a closed invitation-only platform, thus guaranteeing every single review we have received is matched to a genuine customer who has transacted with us.
We remain committed to providing the best customer experience to every customer and it is through a transparent feedback process that we truly understand what we really do right and, sometimes, wrong. You can be sure that our reviews, because of our relationship with an independent feedback service, are the opinions of genuine customers.
Click to view our independent Feefo review profile
Trusted Customer
17 July 2019 13:27
Very helpful with their advice
DEVIreg Touch Programmable Thermostat (Pure White)
Top bananas in always apple pie
Ceramica Tiling Services, Nottingham
13 July 2019 22:23
Had a few heat mats of these guys, and quite a few customers have gone direct now as well. Very good service, the staff are helpful and delivery is quick. This is the only place I get underfloor heating from now
Thank you very much for this really great feedback.
Single Sided Tape (50m)
Good quality tape so it does actually stick and stay stuck
Superspray Adhesive for Matting (500ml)
Don’t really find I need this often as long as you prime floor properly but bonus incase you do
SmartMat 150w/m2 10.0m2 1500w Underfloor Heating Mat
Good quality and great price
SmartMat 150w/m2 20.0m2 3000w Underfloor Heating Kit + Harmoni 25 Thermostat
Good quality product, easy to fit
Harmoni 25 Programmable Thermostat
Comes in the kit and looks good for the price
Flexible Conduit for Floor Sensing Thermostat Per Metre
Think it could be longer piece
Christopher Mcclelland
14 May 2019 10:05
Excellent to deal with and extremely fast delivery.
Fantastic to hear, thank you very much for your review.
DEVIcomfort 150W/m2 DTIR-150 1.5m2 225W Underfloor Heating Mat
Excellent product. Easy to install.
Rodney Chilcott, Balloon. Scotland
12 May 2019 09:31
Ordered item on the Monday and arrived Tuesday. Fitted and set up same day. What can I say other than delighted. Thank you.
Brilliant to hear, thank you very much for leaving such a great review.
Aube TH232 Switchable Sensing Programmable Thermostat
Item ordered on Monday. Arrived Tuesday. Set up and working same day. What can I say other than delighted. Thank you
Trusted Customer
22 April 2019 23:33
'Garden room floor heating.'
Bought again from Underfloor Heating. Always great service. Competitive pricing with efficient delivery.
Thank you very much for the really fantastic review of our service we appreciate your great comments.
DEVIcomfort 150W/m2 DTIR-150 7.0m2 1050W Underfloor Heating Mat
Does what it says. Works fine.
Trusted Customer
9 April 2019 09:09
'Underfloor heating not working'
received the information I required. Thanks for your help.
Thank you very much for taking the time to leave great feedback.
DEVIreg Touch Programmable Thermostat (Pure White)
Problem solved! Thanks very much.
Peter England
8 April 2019 08:59
'Excellent'
Swift and Efficient
Thank you for the fantastic comments and 5 star feedback of our service.
Trusted Customer
2 April 2019 07:24
'Great service'
Competitive prices, and great speed of delivery. Needed a few extra items and they had them with me the following day. Would recommend.
Fantastic, thank you for the great review and recommendation.
Richard Turner
1 April 2019 18:12
'This is what customer service is about'
Very efficient service, very knowledgeable staff and an excellent product
Many thanks for your really fantastic feedback, it is very much appreciated.
Heatmiser neoAir Smart Thermostat (Glacier White) V2
It says smart on the pack and it is smart to set up, very good product
Malcolm Calvert
20 March 2019 09:06
The thermostat was delivered exactly to the time scale informed by email. Cannot comment on the product yet, due to be wired by our electrician this weekend.
Thank you very much for taking the time to review our service as excellent, we appreciate your great comments.
Jim Thornton, Wokingham
11 March 2019 08:17
'Great service, very efficient'
Would definitely use Underfloor Heating UK again
Thank you very much for the fantastic review of our service and advice, we appreciate the 5 star feedback.
DEVIreg Smart Programmable Thermostat (Black)
Great service, very helpful pre sale advice
Trusted Customer
23 February 2019 21:40
Quick delivery, good price and informative web site
Brilliant to hear, thank you very much for the great review.
Tony Price
21 February 2019 15:24
Fast quick delivery
Thank you for the review of our great delivery service.
Aube TH131 Floor Sensing Manual Thermostat
Does things easier then a digital one
Charles Christmas
18 February 2019 15:31
'If only all companies operated like this.....if !'
Having dealt with this company before, I already had a contact name in this firm, who knew of me, found my details and handled the new sale without hindrance.
Thank you Liam......keep up the great work
CFC Electrical
Brilliant to hear, thank you very much for the great review of our efficient service. I will pass on the fantastic feedback to Liam and we look forward to hearing from you again soon.
DEVIreg Touch Programmable Thermostat (Pure White)
Good quality stock at good prices.....and free delivery!!
Nick Beck
11 February 2019 11:05
Quick, easy and efficient.
Brilliant to hear, thank you very much for the really great review.
eMat Pro 150w/m2 12.0m2 1800w Underfloor Heating Mat
It works. Simple and well made.
Trusted Customer
10 February 2019 08:07
'Fast delivery just to the wrong address.'
I put in a different address for shipping but it was delivered to the billing address.
Thank you for your feedback. As this order was all done online and paid through paypal - you would have put in all of your own details in the shipping address and billing address. Paypal however, often default your shipping address to your billing address before we even get to see the orders.
I am very sorry about this confusion and unfortunate delivery mistake.
Kevin Simms
4 February 2019 08:18
'Very good'
Very straight forward. Arrived on time in good condition...fair price... would recommend them...
Thank you very much for the great review of our service and recommendation.
Honeywell V4043H 22mm 2 Port Motorised Zone Valve
Straight forward purchase
Paul Butler
29 January 2019 07:29
Great mat, would use again ,
Easy to use good adherence
Fantastic to hear, thank you very much for taking the time to review us.
Steve Price
26 January 2019 08:52
Order arrived within 2 days 1st class service.
Brilliant, thank you for the really great review of our service and delivery.
DEVIreg Touch Programmable Thermostat (Pure White)
Simple to set up and use.
Wendy Seward
21 January 2019 07:12
'Great service'
Excellent
Thank you for the great feedback.
Aube TH131 Floor Sensing Manual Thermostat
Excellent service, next day arrival
Trusted Customer
20 January 2019 11:55
'Very quick delivery'
Very quick delivery.
Thank you very much for taking the time to review us as excellent, we appreciate it very much.
DEVIreg Touch Programmable Thermostat (Pure White)
This item replaced an older unit that had stopped working. Easy to install and use. Very pleased with it.
Griffins Electrical Services, E Sussex
20 January 2019 09:52
Excellent service as always, with prompt next day delivery.
Thank you very much for the great feedback of our excellent service.
Chris Owen
20 January 2019 08:47
'Prompt and value for money'
Good price. Quick service.
Fantastic, thank you for the great review.
Trusted Customer
2 January 2019 13:20
Rapid delivery even in the run up to christmas
Thank you for the really great 5 star review of our service and delivery, we appreciate the fantastic feedback.
DEVIreg Touch Programmable Thermostat (Pure White)
Just what I wanted. Matched an existing product
Ian Wheatcroft
18 December 2018 06:50
'Excellent service'
Excellent delivery service, very prompt. Very prompt despatch.
Thank you very much for the great review of our service and prompt delivery.
DEVIcomfort 100w/m2 DTIR-100 9.0m2 900W Underfloor Heating Kit
Devimat is very easy to install and always deliver the expected results
Trusted Customer
16 December 2018 10:16
'Very good overall service'
Excellent prompt service . Delivery was to Ireland and was good - if not excellent . Could possibly have been delivered a day earlier which would have been helpful but wasn’t a deterrent to using this service again
Thank you very much for your great feedback on our service and delivery.
Andy Pendry
16 December 2018 10:10
Excellent service & product. Will definitely recommend & use again.
Jayson Forrest
8 December 2018 08:03
'Good customer services'
very helpful
Thank you for your great feedback.
ProWarm 12mm European Standard Pex-Ai-HDPE Pipe 80m
great arrived on time staff very helpful
Trusted Customer
1 December 2018 07:19
'Great experience'
Excellent experience. Very easy. Rapid service with email updates. Delivered next day. Would use again. A really easy purchase
Manjeet Singh Dhani
28 November 2018 14:25
'Excellent price'
Fast delivery
Thank you very much for the fantastic 5 star review.
Honeywell V4043H 22mm 2 Port Motorised Zone Valve
Excellent product and value for money
Trusted Customer
28 November 2018 09:17
On-line site easy to use, kept informed of delivery and arrived as per notification.
Product arrived undamaged.
Brilliant, thank you very much for the great review.
6mm XPS Premium Insulation Board 1200x600mm
Thin insulation board , easy to handle and cuts easy with a stanley knife
Trusted Customer
28 November 2018 08:07
Easy to set up over the phone, good service and good communication
DEVIreg 535 Programmable Thermostat (White)
it works jus the way I expected it to
Michael Till
20 November 2018 07:39
'Excellent supplier and product'
Very good sales support - always helpful. Excellent p&p and prompt delivery.
New Devireg Touch controller is a vast improvement over original ‘clunky’ device. Is easy to install and set up using instructions and works perfectly.
DEVIreg Touch Programmable Thermostat (Pure White)
Excellent replacement for original. Easy to install and setup and works perfectly. LCD display is a tad on the bright side for my taste, (located in bedroom), even in dimmed mode but soon got used to that.
Anil Dattani
13 November 2018 15:52
'Efficient'
The price was reasonable and delivered the next day! What more can one ask?
Thank you for taking the time to leave such great feedback.
Alan Wood
13 November 2018 07:42
I would definitely recommend them to others & I would use them should the need arise.
DEVIreg Touch Programmable Thermostat (Pure White)
I needed this product to replace a faulty Devireg controller
Trusted Customer
13 November 2018 06:27
I was sent the wrong part. Similar but not the one I ordered. . I checked my order, and I definitely ordered the correct one. I already had a thermostat in position, which wasn’t working and I wanted the identical one so that I could just replace the front cover. Instead of just replacing the front cover I now have to pay for an electrician to come out to replace it fully.
Heatmiser Slimline Thermostat V1
It’s still not fitted so no feedback possible yet
Ben Clarke
12 November 2018 06:35
'Very good.'
Reasonable price, prompt delivery! What’s not to like? Will use again.
Thank you for your great comments regarding our service and fast delivery, we appreciate your feedback very much.
Honeywell V4043H 22mm 2 Port Motorised Zone Valve
Just the job
Jacqui Bell
10 November 2018 11:55
'Excellent service '
Dealt with Dean and can’t thank him enough very professional patient and really helpful 10 out of 10 asset to the company
Thank you for your lovely comments. I'm really pleased that Dean was able to offer helpful advice to you and have passed on the fantastic feedback. If you need any further assistance please do not hesitate to contact us on 01473 276686.
Two Ltd
9 November 2018 09:10
Fantastic Service, Quick Delivery. Will use Underfloor Heating UK for all of our underfloor heating projects
Thank you very much for your really great review. I will pass on your positive comments to our sales, technical and administration team and look forward to hearing from you again.
Single Sided Tape (50m)
Excellent Product, Fantastic Value for Maoney
DEVIcomfort 150w/m2 DTIR-150 8.0m2 1200w Underfloor Heating Kit
Excellent Product, Just What We Wanted
DEVIcomfort 150W/m2 DTIR-150 8.0m2 1200W Underfloor Heating Mat
Excellent Product. Fits Our Requirement Perfectly
Gary Stockwell
7 November 2018 17:24
'Very good experience with web site and delivery.'
Delivery very quick and efficient.
That is really fantastic to hear, thank you very much for the great feedback of our website and delivery service.
DEVIreg Touch Programmable Thermostat (Pure White)
Good product. Better than old model thermostat.
Tim Clark
31 October 2018 06:27
'Excellent Service'
Excellent service!
Thank you very much the excellent review.
DEVIreg Touch Programmable Thermostat (Pure White)
Excellent service and product, easy to install and use.
Robert Watts
29 October 2018 10:26
'Hassle free will use again'
Easy to use
Delivered on time
Will use again
That is great to hear, thank you for the positive feedback.
Robert Greive
27 October 2018 08:02
The service was prompt and quick
DEVIreg Touch Programmable Thermostat (Pure White)
It has the capability to monitor your heating needs
Peter Rogers, Appley Bridge
25 October 2018 22:13
'Helpful Company'
I discussed the product with the company before purchase and they were very helpful
Thank you for the great customer service review, we appreciate your feedback.
John Sailbery
23 October 2018 15:43
'Great service, Highly recommended'
Great service, and tech support. Highly recommended
SmartFoil 140w/m2 Mat - 4.0m2, 560w
Great purchase. easy to follow guide, tech back up
Sandra Barron
21 October 2018 11:46
'Excellent service'
Ease of use on website. Quick delivery. Good price.
Thank you for taking the time to review our service and website as excellent, we really appreciate it.
DEVIreg Touch Programmable Thermostat (Pure White)
Replacement for part that broke
Peter Tribe, Bradford On Avon
21 October 2018 11:31
'Underfloor Htg UK GOOD; DEVI Reg Touch instructions useless'
Underfloor did extremely well, delivery next day, and they were very helpful when I needed to query the instructions for setting up the DEVIreg Touch underfloor heating timer.
I would not agree with all the statement that this timer is easy to set up.
Many thanks for your comments.I am very sorry to hear that you did not find the Devi Touch easy to operate. Devi do offer a portal programmer which when completed allows you to add a simple 5/6 digit code which pre-programs your Devi touch unit for you making the process a lot easier.
I certainly hope that this helps.
If we can be of further assistance please do not hesitate to contact us.
DEVIreg Touch Programmable Thermostat (Pure White)
The instructions included with the timer stop halfway through the process, and you need to download/print at least 30 pages off the internet to figure out how to operate it.
The instructions from Devi also give you touch.devi.com to refer to, and this page does not exist on the internet, and also refers to a web code interface set up via a 'web generated code', and if you try to open it on the net you get a warning 'DANGER do not open' on your screen.
So it would be helpful if Underfloor heating could either include their own instructions for the uninitiated like me, or insist that DEVI produce instructions that are actually correct.
Link for Touch http://heating.danfoss.com/external/flash/virtualstat/DRT_FullLoad.swf
Please note - This will only work if opened in Internet Explorer
Nick Webster
21 October 2018 10:40
Good web site & prompt delivery for a good product.
Fantastic, thank you very much for the great comments.
ProWarm Digital Thermostat (White) + Remote Control
Good web site, product, price & prompt delivery.
Oksana Romanovska
21 October 2018 06:35
excellent
Thank you for the 5 star service rating.
DEVIcomfort 150W/m2 DTIR-150 10.0m2 1500W Underfloor Heating Mat
happy about everything , will recommended
DEVIreg Touch Programmable Thermostat (Pure White)
easy to control, nice look
Trusted Customer
18 October 2018 07:46
'Fantastic service'
Under floor heating is not something that you buy everyday so making the right choice can appear to be a little daunting, so any help you can get is appreciated .
The staff at the Element Shop were great, despite the number of emails I sent asking various questions they always answered quickly with easy to understand information.
They were also the cheapest supplier of the Prowarm heating kit that I could find and the item was delivered the day after ordering.
Thank you very much for your great feedback of our service and advice , we appreciate your praising comments.
Trusted Customer
15 October 2018 16:34
Very good and would definitely recommend.
That is fantastic to hear, thank you very much for the recommendation.
DEVIreg Touch Programmable Thermostat (Pure White)
Cannot comment at the moment about the Thermostat being fitted next week.
Errol Francis
14 October 2018 18:58
Have used these guys twice now. Very responsive. Next day delivery. Efficient and friendly service.
Thank you very much for the great service review. We do our very best to ensure that we provide excellent customer service for all of our customers.
DEVIreg Touch Programmable Thermostat (Pure White)
One stop shop. o qualms. Very quick and easy to deal with.
Richard Smith, Cheshire
10 October 2018 15:13
'First Class !!!!'
Great service - very knowledgeable staff on the helpline - advised of exactly which item was compatible as a replacement for an obsolete stat, and prices are very competitive too. Also delivery was perfect as arranged. All in all excellent, and will definitely use again.
DEVIreg Touch Programmable Thermostat (Pure White)
Excellent item as recommended by Underfloor Heating as direct replacement for existing obsolete unit (DeviReg550)
DEVIcomfort 100w/m2 DTIR-100 2.0m2 200W Underfloor Heating Mat
Great product at a great price!
Claire Flynn
10 October 2018 07:52
'Excellent see'
Advised on order, part was obsolete but recommended alternative which works perfectly and arrived promptly
DEVIreg Touch Programmable Thermostat (Pure White)
Excellent though requires a bit of patience to set!
Imad Fathallah
9 October 2018 08:36
Helpful and professional
Steve Adams
1 October 2018 20:23
great service excellent delivery time
Demista 230V Heated Mirror Demister Pad 785mm x 524mm
just great quality does as it should
Trusted Customer
1 October 2018 16:25
Fast Service
Paul Bentley
29 September 2018 08:35
'Good Service'
Good price and speedy delivery.
DEVIreg Touch Programmable Thermostat (Pure White)
Very easy to install, commission and operate
Trusted Customer
24 September 2018 22:20
'Excellent service'
Excellent service quick and easy. Stock the best products at the best price will definitely order future products from them .Highly recommend them
DEVImat 200W/m2 DTIF-200 6.10m2 1210W Underfloor Heating Mat
The best mat on the market.
DEVIreg Smart Programmable Thermostat (Polar White)
Versatile options Excellent
DEVImat 200w/m2 DTIF-200 6.10m2 1210w Underfloor Heating Kit + DEVIreg Smart Thermostat (Polar White)
The best underfloor electric heating mat on the market with a 20 yr guarantee.
Trusted Customer
19 September 2018 23:50
'Great service'
great service
thanks
Martyn
19 September 2018 08:50
'Fast service'
Supplied the expected parts at half the price of the nearest competitor and with free next day delivery.
Raychem Green Leaf Touch Screen Programmable Thermostat
Replaced an old unit which had become unresponsive, underfloor heating works perfectly now.
Trusted Customer
18 September 2018 13:50
'Happy'
Happy
Trusted Customer
16 September 2018 10:26
'Great price'
Item arrived very quickly and it was a really good price
Thank you very much for the great service review, we appreciate your fantastic comments.
Honeywell V4043H 22mm 2 Port Motorised Zone Valve
Great price and fast delivery
Trusted Customer
16 September 2018 07:09
'Very helpful staff'
I was given lots of helpful advice on the phone. The item was dispatched and arrived promptly. A very positive experience.
This is fantastic to hear, thank you very much for your positive feedback.
DEVIreg Touch Programmable Thermostat (Pure White)
Great product - easier to use and programme than the 550.
Ewen Cameron
11 September 2018 17:47
Best price on the net and delivered next day, brilliant.
Fantastic to hear, thank you very much for taking the time to review our service as 5 star.
Trusted Customer
8 September 2018 07:59
'Fantastic service and competitive prices'
The company could not have been more helpful. They offer guaranteed next day delivery but for personal reasons I needed a delayed delivery. The item arrived as requested via DPD the best courier company. Many thanks Underfloor Heating.
You are very welcome, thank you for the great review.
DEVIreg Touch Programmable Thermostat (Pure White)
I am trying this new controller for my heating. So far it is much more simple to program and use. It also looks really good, showing the room temperature.
Thomas Ballard
8 September 2018 07:38
Great service and very prompt delivery. Absolutely spot on. Easily contactable - I would recommend to anyone.
Thanks
Thank you for the great review of our service, we appreciate the positive feedback.
20mm Premium Thermal Substrate Insulation Board 1200x600mm
Prompt delivery and great service
Raymond F York
6 September 2018 09:29
Professional, efficient service, understood my requirements and fully explained the product.
Brilliant, thank you for the great service review.
DEVIreg Touch Programmable Thermostat (Pure White)
Easy to install and set up. Touch screen an excellent improvement.
Antony Evans
4 September 2018 09:02
Helpful sales staff. Next day delivery all packed well. Great price. Nothing more you could want.
Thank you very much for your wonderful comments about our fantastic sales team, we appreciate it greatly.
SmartFoil 140w/m2 Mat - 12.0m2, 1680w
Good product, well made mat.
Derron Roberts
29 August 2018 09:15
Great prices and extremely fast delivery.
Brilliant, thank you for taking the time to review our service as excellent.
Paul Batten
28 August 2018 08:40
Good helpfull shop service, let down by delivery company,!
Robert Dally
26 August 2018 07:55
'Fantastic Service.'
Fantastic, super fast dispatch and delivery, Perfect.
Thank you very much for your really great review, we appreciate your brilliant comments.
DEVIreg Touch Programmable Thermostat (Pure White)
Item was dispatched same day and delivered the next. It doesn't get any better. It allowed us to get our underfloor heating back on and working the next day. Brilliant.
William Crawford
20 August 2018 12:54
First Class Service, Delivered On Time
Brilliant, thank you for the great feedback of of our service.
Trusted Customer
18 August 2018 07:03
Great and good value experience
Thank you for the great feedback of our service.
Honeywell V4043H 22mm 2 Port Motorised Zone Valve
Great experience thank you
Kevin Majmudar
11 August 2018 17:52
'Great prices, superb website and service'
Very good website, easy to use, great prices and my order was shipped on the same day so arrived super fast despite being past cut off time. Cannot fault any part of the process and WILL use again. A*
Thank you very much for your really wonderful A* review of our service, we appreciate your fantastic feedback.
Heatmiser neoStat Programmable Thermostat (Platinum Silver) V1
Great product as per usual Heatmiser quality
Steve Fitton
1 August 2018 14:31
'Efficient and trustworthy'
Always available by 'phone to answer any technical questions and when they say they will get back to you they actually do. Fast and free delivery. Refunded me for a faulty item without any quibble and collected the old unit F.O.C. Recommended for anyone thinking of installing underfloor heating.
That is really fantastic to hear, thank you very much for taking the time to leave such great feedback.
SmartFoil 140w/m2 Mat - 9.0m2, 1260w
Quick to heat up and completely unobtrusive. We love it.
Stephen Buckley
22 July 2018 13:18
'5* all round - price, speed of delivery and quality of goods. No messing ..'
Researched the item, sourced the item, ordered the item, received the item speedily and efficiently and fitted the item that was exactly as described and works perfectly. What more could I expect. I would deal with Element Shop again and will probably order another of the same very shortly to replace another zone valve that isn't as good quality as Honeywell.
Thank you very much for your fantastic review and we look forward to hearing from you again soon.
Michael Dobson
21 July 2018 07:08
Great product, quick delivery. Will use again if the need arises.
Brilliant, thank you for the great review.
Raychem Green Leaf Touch Screen Programmable Thermostat
Excellent looking and easy to use.
David Barouch, London
10 July 2018 08:03
'Great service'
Very helpful knowledgeable and all round service 100% would recommend
Thank you very much for your fantastic review.
Trusted Customer
23 June 2018 19:51
'Efficient Service with helpful advice'
Excellent technical support information and I did not have to wait long on the phone to speak to an adviser
Fantastic to hear, thank you for the great feedback.
Naj Patel
19 June 2018 08:38
'Frustrated!!!!'
Despite numerous emails and phone calls to your office telling you not to send order details to my email address, you still keep sending them to me.
When an order is placed by Storage Concepts Ltd, the person placing the order should be contacted at their email address, not mine.
My name is David Paget, Naj Patel placed this order. Check your records for his email address.
Thank you for your review. When an order is placed either online or by telephone the email used/given is the automatically emailed confirmation as our software system is set up to do this. We can only email details regarding orders to email addresses given to us and use the records provided by our customers.
Martin Breen, Dublin, Ireland
7 June 2018 11:33
'Fantastic product, fantastic people to deal with.'
My original query was answered very quickly and the follow up supply of goods was equally excellent. Great customer service.
Fantastic, thank you for the great review of our service.
DEVIcomfort 100w/m2 DTIR-100 3.0m2 300W Underfloor Heating Kit
This product did the job it was intended for - easy to install and use.
DEVIcomfort 100w/m2 DTIR-100 3.0m2 300W Underfloor Heating Mat
an easy choice for the floor i needed heated
Single Sided Tape (50m)
Simple, quick & easy to use -
DEVIreg Touch Programmable Thermostat (Pure White)
A fantastic little piece of equipment - easy to install, easy to follow instructions.
Superspray Adhesive for Matting (500ml)
Quick, simple & easy to use - a great help to do the job
Bruce Shearman
24 May 2018 12:33
'Reducing installation information is not a good idea!'
Your service was quick and efficient. My concern was with the DEVI product information and installation information. I have previously fitted a DEVI mat however the installation information was minimal and no explanation given for the pack content. Fortunately I remembered most of the installation steps. The one that I didn't was answered by DEVI customer help. My point is that the product is good but the installation information is poor as is the online information. If DEVI ask you can feed back this information to them.
Regards
B.S.Shearman
DEVIcomfort 100w/m2 DTIR-100 2.5m2 250W Underfloor Heating Kit
As in section 1 lack of installation information.
Single Sided Tape (50m)
No information about the use of this!
DEVIcomfort 100w/m2 DTIR-100 2.5m2 250W Underfloor Heating Mat
Mat does not appear to be as sticky as a previous product