The best danfoss thermostats, compared.
Top pick: Danfoss Redia RA click – Highest score in this comparison, 9.5 out of 10, from 235 amazon.co.uk reviews. Best value: Danfoss Redia RA click – About £16.99 with 4.8 from 235 reviews, the lowest price in this set, for a tool-free spare on an existing Danfoss RA click valve. Updated October 2026.
A Danfoss thermostat on amazon.co.uk is a liquid radiator head, a Bluetooth head for one radiator, or a 230 V wall stat for the boiler or an underfloor manifold. A wall stat does not set one bedroom on its own. Judge the listing by the valve connection, the UK star line for that job, and whether the attributes agree with the title. The uses Bluetooth at about 10 m, so it is not a control from outside the house. The [Danfoss thermostat buying guide](/hub/thermostats/danfoss-thermostat/sub/danfoss-thermostat-buying-guide) asks which of those jobs you actually have.
A Danfoss thermostat on amazon.co.uk is a liquid radiator head, a Bluetooth head for one radiator, or a 230 V wall stat for the boiler or an underfloor manifold. A wall stat does not set one bedroom on its own.
26 products checked · 61 hrs invested · +19,200 readers
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Personal buying guide
Question 1 of 2
Where does it fit?
The Danfoss Redia RA click (015G5120) is a liquid-filled head that UK reviewers fit by setting the dial to 5, pushing it onto a Danfoss RA valve, then turning it back to a number. At about £16.99 it is the cheapest listing in this set, and the star line is 4.8 from 235 amazon.co.uk reviews. Those written reviews are short, so they praise the click-on swap more than they describe long-term faults. The bullets claim a 0.2 K control band and an 18-minute response, plus up to 2% against traditional liquid heads; this comparison did not measure either figure. Series data quotes 0.2 K as a test figure, not a bill saving. It will not thread onto an M30x1.5 valve. There is no schedule and no app. A separate attribute block also says 230 V, an LED, Wi-Fi and battery power, which the liquid-head title does not support, so treat that block as a listing error.
Pros
Cons
Best for: Replacing a Danfoss RA click head.
Less suitable: An M30 valve, or anyone who wants a schedule.
Specifications
Common questions
Does it need tools?
The bullets say a tool-free click onto a Danfoss RA valve. UK reviews describe setting it to 5, pushing it on, then setting the number.
Will it fit an M30 valve?
The listing specifies a Danfoss RA connection. It does not fit M30x1.5.
Does it use batteries?
The bullets do not mention batteries. A separate attribute line says battery powered, and that line conflicts with the liquid-head title.
The Danfoss RAS-C2 (013G6040) is a liquid head with a built-in sensor, frost protection, and positive shut-off, on a scale from 8 °C to 28 °C, with no batteries. UK reviewers describe it as easier to fit and remove than the older TRV it replaced. The bullets claim the change takes under 30 seconds and that the system does not leak if the valve body stays in place. The star line is 4.7 from 73 reviews, at about £30.18, which is above the Redia click head in this set. It fits a Danfoss RA valve, not M30x1.5, so you cannot treat this listing as a universal spare. A figure of up to 40% off the heating bill appears as a listing claim and was not measured here. Attribute lines also mention ZigBee, 230 V, a touchscreen and wall mounting, none of which the head-only title supports.
Pros
Cons
Best for: Replacing a failed Danfoss RA radiator head when you want the RAS-C2 sensor.
Less suitable: A schedule, an app, an M30x1.5 valve, or a boiler wall stat.
Specifications
Common questions
Is this only the head?
The included-components line says a built-in sensor. The bullets describe swapping the old head, and say there is no leakage if the valve body stays in place.
Do UK reviews mention fitting?
UK reviews call it a replacement for an older TRV and say it is easier to fit and remove.
Is the 40% saving measured here?
That figure is a listing claim. This comparison did not measure a bill.
The Danfoss TP5000Si (087N791000) is a hardwired room thermostat, and the title says it is not RF. UK reviewers describe a straight swap onto the existing backplate, and one mentions an adjustable holiday setting against a fixed 5 degree setback on an older TP5. Another used it as a replacement on an Alde heater that had already been running a Danfoss control. The schedule in the listing is 24 hour or 5/2 day, with up to six events a day, and the star line is 4.3 from 394 reviews. This amazon.co.uk listing is priced at about £280, far above the TPOne at about £32.49 in the same set, so the rating does not make it the sensible first programmable stat. Attribute lines say Wi-Fi and battery power, which the hardwired title rejects, and the model-name field says TPOne. Treat about £280 as the price of this listing, not as proof of a feature the title does not name.
Pros
Cons
Best for: A like-for-like hardwired TP5000Si replacement if this listing price is acceptable.
Less suitable: A first programmable stat when cheaper Danfoss wall stats are in the same set.
Specifications
Common questions
Is it wireless?
The title says hardwired, not RF. A separate attribute line says Wi-Fi. UK reviews describe a swap onto the original backplate.
Why is the price about £280?
About £280 is the price printed on this amazon.co.uk listing. It is far above the other Danfoss thermostats in this set.
What do UK reviews praise?
A like-for-like backplate fit, an adjustable holiday setting versus a fixed 5 degree setback on a TP5, and use as a replacement on an Alde heater that had used a Danfoss control.
The Danfoss Eco 014G1115 is a Bluetooth radiator head that UK reviewers use to keep one room, such as a bedroom, cooler while the rest of the heating stays on. It takes two AA batteries, which the bullets say last about two years, and Danfoss describes Bluetooth at about 10 m, so it is not a control you can change from work. Across 550 amazon.co.uk reviews the rating is 3.8, and the written UK texts mention slow Bluetooth unless you are close or you press the button or turn the ring, plus overshoot and an E6 fault. One review says the app only offers two temperatures for the day, even though a holiday setting is mentioned once the phone connects. The box includes adaptors for Danfoss, M30, or M28 bodies. The claim of 95% of radiators and the claim of up to 30% energy savings stay listing claims. Before you fit it, a UK review says the valve pin must push in and spring back. At about £33.95 it sits only a little above the RAS-C2, and it is the wrong buy if you only wanted a plain spare head.
Pros
Cons
Best for: A schedule on one radiator, controlled in the same room.
Less suitable: Control away from home, or a simple spare head.
Specifications
Common questions
Can you change it from outside the house?
Danfoss describes the Eco app at about 10 m by Bluetooth. UK reviews say it is not a Wi-Fi control for when you are away, and that Alexa needs a separate device.
What do UK reviews say about the app?
Reviewers say Bluetooth is slow unless you are close, or you press the button or turn the ring. One review says only two temperatures can be set for the day.
What should you check on the valve?
A UK review says the pin must push in and spring back before you fit the head.
The Danfoss RET2001 (title code 087N6471) is a digital wall thermostat at about £52.05 whose bullets list a large backlit display of room temperature and output status, plus holiday mode, frost protection, and maximum and minimum limits. One UK review says it works well once fitted. The same review had only black and brown conductors against three terminals, Danfoss support would not say which terminal to leave unused, and an electrician neighbour finished the job. The star line is 3.8 from 10 reviews, with only two UK texts in the listing. The listing does not state a voltage, so the supply stays unknown from this page alone. A size line of 86 cm by 30 cm also conflicts with a 7 cm depth, which means you should not plan the back box from that attribute. It is a wall stat for someone who already has an electrician to identify the terminals, rather than a wiring exercise from an unexplained two-wire plate.
Pros
Cons
Best for: A digital Danfoss room thermostat when an electrician identifies the terminals.
Less suitable: A DIY wiring job from an unexplained two-wire plate.
Specifications
Common questions
What voltage does the listing state?
The listing does not state a voltage. Power stays unknown until a Danfoss sheet for this exact code is checked outside this page.
Can you wire it from two conductors?
One UK review had black and brown only, and three terminals on the stat. Danfoss support did not say which terminal to leave unused, and an electrician neighbour fitted it.
Does it show the room temperature?
The bullets say a large backlit display shows room temperature and output status, with maximum and minimum limits.
The Danfoss TPOne (087N785100) is a hardwired programmable room thermostat at about £32.49, not a head you click onto a radiator. The listing states 230 V, a backlit LCD, and bullets that describe a flexible schedule with clear-text menus. One UK reviewer swapped it for a TP5000 and found the fixing holes matched. The other UK text says the unit was faulty and the seller did not reply. The star line is only 3.7 from 8 reviews, and the listing holds just those two UK texts, so the sample is too thin to judge reliability. Attribute lines also claim BACnet, a smartphone and AA batteries, and the manufacturer part-number field reads TRV_2131556, which fights the room-stat title. Buy it only if a small review count is acceptable and you are replacing a wall stat, not a TRV.
Pros
Cons
Best for: A hardwired programmable room thermostat if the review sample is acceptable.
Less suitable: A radiator head, or a buyer who needs a large UK review sample.
Specifications
Common questions
Is it a radiator head?
The title says a hardwired programmable room thermostat. It is a wall control, not a TRV head.
Did a UK reviewer swap it for a TP5000?
One UK review says an upgrade from a TP5000 matched the fixing holes. The other UK review says the unit was faulty and the seller did not reply.
How many UK reviews are written in the listing?
The listing shows 3.7 from 8 reviews. It contains two UK texts, so the written sample is thin.
The Danfoss BasicPlus2 WT-D (088U0622) is a 230 V wall thermostat listed at about £80. Danfoss describes it as a wired, in-wall control for underfloor actuators, with no week schedule, so it is not a TRV. The only feature bullet says remote access via Wi-Fi. The attribute table adds 10 W, a display with backlight, a wall-mount bracket and a wireless adapter, and it names heating and cooling. The star line is 3.6 from 13 reviews, but the three written reviews are from Germany, so they are not UK opinion and you cannot use them as evidence that Wi-Fi control works on a British system. There are no app steps in the listing and no UK review that describes connecting to Wi-Fi. At about £80, with almost no description beyond that single bullet, this listing only makes sense if you already know the WT-D and you accept a thin page.
Pros
Cons
Best for: Only if you already know the WT-D and you accept a thin listing.
Less suitable: A buyer who needs UK reviews or a described week schedule.
Specifications
Common questions
Does the listing prove Wi-Fi control?
The only bullet says remote access via Wi-Fi. Danfoss describes the WT-D as wired and in-wall, with no week schedule. The listing has no app steps and no UK review that describes Wi-Fi.
Are there UK written reviews?
The star line is 3.6 from 13. The three written reviews are from Germany, so they are not UK opinion.
What voltage is printed?
The attribute table says 230 V and 10 W.
Shelf prices, stars, and review counts are the amazon.co.uk figures stored for these seven listings. They are not a live reload on 17 October 2026. The number on each card is the star line times 20. It is not a laboratory test and not a measured gas saving. Thin UK samples, attribute conflicts, and the about £280 TP5000Si price stay in the written assessment. The weights below are the buying checks used to read the set.
Job
25%A radiator head, a wall stat, and an underfloor stat are different outputs. A radiator head does not switch the boiler. A wall stat does not set one bedroom on its own. The BasicPlus2 WT-D drives 230 V underfloor actuators and is not a TRV.
Valve connection
25%The Redia and the RAS-C2 fit Danfoss RA valves, not M30x1.5. The Eco listing includes RA and M30 adapters. An RA click ordered for an M30 valve will not mount.
Power and who fits it
20%Liquid heads have no batteries. The Eco uses two AA cells. The TPOne, TP5000Si, RET2001, and BasicPlus2 are mains wall stats. A click-on is household work if the pin springs back. Mains wiring needs someone competent to BS 7671.
Reference room and listing honesty
15%When a boiler is replaced, the Part L pattern is a room thermostat in one room and TRVs elsewhere, not a TRV in that room. Ignore Zigbee, Wi-Fi, or 230 V lines on a liquid head. The BasicPlus2 listing says Wi-Fi; Danfoss says wired, in-wall, with no week schedule.
UK stars and shelf price
15%The card score is the amazon.co.uk star line times 20, not a lab score. The RAS-C2 is the top pick on the UK replacement reviews. The Redia is the best value at about £16.99 with 4.8 from 235. The about £280 TP5000Si is not the top pick on stars alone.
Start with the job, then the valve connection, then whether the work is a click-on or 230 V wiring. A star rating does not tell you those three. The seven listings below are amazon.co.uk pages, with the prices and review counts stored for this comparison, not a live reload on 17 October 2026. A liquid head does not switch the boiler. The Eco does not work from outside the house. A higher number on the dial does not heat the room faster.
A Danfoss thermostat in this set is a liquid radiator head, a Bluetooth head for one radiator, or a 230 V wall stat for the boiler or an underfloor manifold. A radiator head does not switch the boiler. A wall stat does not set one bedroom on its own. You judge a listing by the valve connection, the UK stars for that job, and whether the Amazon attributes agree with the title.
The Redia and the RAS-C2 fit Danfoss RA valves, not M30x1.5. The Eco is the listing in this set that includes RA and M30 adapters. The 95% of radiators line is a listing claim. If the pin is stuck or weeping, or the system must be drained, stop and call a professional.
When a boiler is replaced, BEAMA’s reading of Approved Document L is a room thermostat in one reference room and a TRV on every other emitter. Do not put a TRV in the thermostat’s room. Heads alone are not that pattern, and a Redia head is not a Boiler Plus extra measure.
Danfoss describes Bluetooth at about 10 m, not Wi-Fi from outside the house. A Wi-Fi or 230 V line on a liquid head is a listing conflict. The BasicPlus2 bullet says Wi-Fi, while Danfoss describes that model as wired and in-wall, with no week schedule. Do not treat about £280 and 4.3 stars as a reason to buy the TP5000Si first.
Decide the job before the model code. A radiator head does not switch the boiler. A wall stat does not set one bedroom on its own. The BasicPlus2 WT-D drives 230 V underfloor actuators and is not a TRV. The Redia and the RAS-C2 are Danfoss RA only. The Eco listing includes adapters for Danfoss bodies and for M30 or M28. If the valve is not Danfoss RA, an RA click will not mount.
Liquid heads have no batteries. The Eco uses two AA cells and stays a same-room Bluetooth control, at about 10 m. The TPOne and the BasicPlus2 are 230 V. The TP5000Si title says hardwired, not RF. The RET2001 listing does not state a voltage. A click-on is household work if the pin springs back. Mains wiring needs someone competent to BS 7671. When a boiler is replaced, the reference room has the wall thermostat and the other rooms have TRVs.
Three typical situations, each with a recommendation from this comparison.
You are swapping a failed Danfoss click head and you want positive shut-off, not an app. The RAS-C2 is the top pick at about £30.18, with 4.7 from 73 reviews. It is a liquid RA head with no batteries. It does not fit M30x1.5, and it does not switch the boiler.
You want a schedule on one radiator while the rest of the heating stays on, and you will control it by Bluetooth at about 10 m. The Eco is about £33.95, with 3.8 from 550 reviews. It is not Wi-Fi from outside the house, and it is the wrong buy if you only wanted a plain spare head.
The valve is already a Danfoss RA click, and you want the cheapest liquid spare in this set. The Redia is the best value at about £16.99, with 4.8 from 235 reviews. UK reviews describe a tool-free click-on. There is no schedule and no app.
The top pick is Danfoss Redia RA click, with the highest score in this comparison (9.5 out of 10, from 235 amazon.co.uk reviews). The best value is the Danfoss Redia RA click, at about £16.99, with 4.8 from 235 reviews, the highest star line and the lowest price here, on an existing Danfoss click valve. The Eco is a same-room Bluetooth schedule, not Wi-Fi from outside. The TP5000Si at about £280 is a hardwired listing, not the top pick on stars alone. The card score is the stored star conversion, not a laboratory test.
Danfoss Redia RA click
Highest score in this comparison, 9.5 out of 10, from 235 amazon.co.uk reviews.
Danfoss Redia RA click
About £16.99 with 4.8 from 235 reviews, the lowest price in this set, for a tool-free spare on an existing Danfoss RA click valve.
Editorial
Peter F. is the editor for DIY & tools at productscompared.co.uk. Comparisons in this category are checked against amazon.co.uk listings, review evidence and public UK sources.
Guides on what to look for, how to use a product, and common mistakes.
Public UK sources for Approved Document L, BS EN 215, Danfoss product data, and Part P. Listings are the amazon.co.uk captures for these seven ASINs, not a live reload on 17 October 2026. Prices on amazon.co.uk move.
This page contains affiliate links to amazon.co.uk. If you buy through them, we may earn a commission at no extra cost to you. Prices, stars, and review counts come from those listings. We did not run a laboratory test. The scores rank a listing inside this set only.
