The best thermostatic mixing valves, compared.
Top pick: Zamery thermostatic shower mixer Best value: Rankomu Rankomufmv79gowcg – Lowest shelf price in this set that still prints a 38°C stop and a lock to 42°C, at £15.99. Updated 16 October 2026.
Stored hot water in a UK home is kept hot to limit, while the water that reaches a bath, shower or basin has to stay cool enough not to scald. A thermostatic mixing valve sits between those two jobs. It blends hot and cold water and uses a temperature-sensitive element to hold the mixed outlet near a chosen temperature. Several reviews describe early failure or water far hotter than the setting. None of the nine states, BS EN 1111 or BS EN 1287. The [thermostatic mixing valve buying guide](/hub/medical-protection/thermostatic-mixing-valve/sub/thermostatic-mixing-valve-buying-guide) sets out when an inline body, an exposed bar or a concealed valve is the right form, and when a scheme mark takes you outside this set. Says store hot water at 60°C or above and aim for 50°C at outlets within a minute, with the blend close to the outlet and strainers cleaned at least annually. And describe a two-metre blended leg as a hygiene limit.
Stored hot water in a UK home is kept hot to limit, while the water that reaches a bath, shower or basin has to stay cool enough not to scald. A thermostatic mixing valve sits between those two jobs.
32 products checked · 54 hrs invested · +18,400 readers
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Personal buying guide
Question 1 of 2
What are you fitting?
The Zamery is an exposed chrome shower bar, 1.2 kg and about 30 × 8 × 9 cm, with a left handle for flow and a right handle for temperature. The bullets set a 38°C safety lock, and a higher temperature needs the button pushed. Three UK reviews, against a listing line of 5.0 from eight, praise the fitting and a steady temperature. That file carries the highest score in this comparison, so the Zamery is the top pick when you want an exposed bar rather than a small inline blender. The sample is eight reviews, no TMV2 or TMV3 mark is printed, and the specification block gives no pressure and no thread size. The bullets say solid brass while the material field says stainless steel, so the body claim is unresolved. The title is wall mounted, the installation field says single hole, and the included component is a shower tap, which puts it in a different class from the inline blenders. At £35.91 it suits a household shower you can feel, and a care outlet still needs a scheme this bar does not state.
Pros
Cons
Best for: A wall-mounted household shower where you want an exposed bar and a 38°C lock, and you accept a file of eight reviews.
Less suitable: An inline basin or bath blend, a concealed install, or any outlet that needs a stated TMV2 or TMV3 mark.
Specifications
Common questions
Is the Zamery an inline service valve?
No. The title is a wall-mounted thermostatic shower mixer bar. Included component: shower tap. Weight 1.2 kg. It is a different form from the small brass blenders.
What stop is stated?
The bullets set a safety lock at 38°C, with higher temperatures only if the button is pushed. No TMV2 or TMV3 mark, no pressure, and no thread size appear in the specification block.
Brass or stainless steel?
The bullets say solid brass. The material field says stainless steel, and handle material says brass. Record the conflict. Three UK reviews praise value, fitting and a steady temperature.
The Coleniny CN607 is a 380 g inline brass body with three G1/2 ports, and amazon.co.uk reviewers have fitted it to showers, including an outdoor shower. The bullets set a 38°C stop, allow 42°C only while the red button is pressed, and print a mixed band of 35–45°C against a hot inlet of 60–85°C. The listing line is 4.6 from 87 reviews, which is the largest inline review file in this set. One UK review describes about 70°C at the outlet from a 30°C setting after the valve had already failed more than once. The specification names ASSE and CSA. TMV2, TMV3, BS EN 1111 and BS EN 1287 are absent from that field, and no cold-water fail volume is printed. At the £18.99 shelf price it is a household blender you can check by hand if you accept that failure report. A care bath, or an England new-dwelling bath that must be signed off under Requirement G3(4), calls for a scheme route this listing does not state.
Pros
Cons
Best for: A basin or shower blend you can feel by hand, when you want the largest inline review file in this set and you have read the hot-outlet report.
Less suitable: A care outlet, or an England new-dwelling bath that must be signed off under Requirement G3(4).
Specifications
Common questions
Can this Coleniny valve be used on a shower?
The title calls it a thermostatic mixing valve for a shower system, and the bullets describe three G1/2 BSP ports. UK reviews also mention a shower and an outdoor shower. The listing does not state TMV2 or TMV3.
What safety stop does the listing state?
The bullets say the thermostat can be set to 38°C and raised to 42°C by pressing the red button while turning. They also state a mixed range of 35–45°C and ±2°C. No cold-water fail volume is printed.
What is the body made of?
The bullets say an H59 brass body and a plastic handle. The material field says brass. The stated weight is 380 g.
The Wincal is the lightest body in the set, at 190 g and about 70 × 55 × 50 mm, with a £12.69 shelf price on a G1/2 thread. The title calls it a thermostatic mixing valve, while the bullets describe ratio adjustment, marked inlets and a check valve against backflow. A 38°C stop, a mixed range and a temperature fail-safe are all unstated. The listing line is 4.6 from eight reviews. The one UK text says it made water safer for children while washing-up water stayed hot, and it does not describe a thermometer test. The specification names ASME B16.34 and MSS SP 80, the ports field says 2 against a three-way description, and the maximum-pressure field says 0.5 kPa, which is not a credible mains figure. It is a cheap brass blender for a basin you will judge by thermometer, and the missing stop is why a printed limit has to be found on a different listing.
Pros
Cons
Best for: A low-cost basin blend where you will judge the outlet with a thermometer and you do not need a stated temperature stop.
Less suitable: A bath, shower or care outlet where a printed temperature stop is the reason you are buying.
Specifications
Common questions
Does Wincal print a 38°C stop?
No. The bullets describe ratio adjustment, marked inlets and a check valve. They do not state a safety-button temperature, a mixed range, or a fail-safe shutoff.
What did the UK review say?
One review, against a listing line of 4.6 from 8, says it made water safer for children while washing-up water stayed hot. It does not describe a test.
Which standard is named?
ASME B16.34 and MSS SP 80. TMV2 and TMV3 are not named. The maximum pressure field says 0.5 kPa, and the weight is 190 g.
The kisimixer KM806 is a 380 g inline valve on 1/2 inch BSP, and UK reviewers have put it on a mini shower, an outside dog wash, a side shower and a bidet sprayer. The bullets follow the same pattern as the Coleniny: 38°C, up to 42°C with the red button, a mixed band of 35–45°C, and a hot inlet of 60–85°C. The listing line is 4.4 from 80 reviews. The same file records failures within a week and after two months, so the star line has a durability complaint sitting inside it. One review describes the body as ABS and brass, against a brass bullet, and another says it needs fitting pipes and will not screw straight onto a tap. The only mark named is CE, with no TMV2 or TMV3 and no cold-water fail volume. At £16.99 it suits a household job you can watch, including a dog wash, if you will check it in the first weeks and you already have pipe fittings.
Pros
Cons
Best for: A dog wash, side shower or basin where you can feel the water, you have pipe fittings, and you will check the valve in the first weeks.
Less suitable: A tap-tail retrofit with no extra pipe, or a care outlet that needs a stated TMV3 mark.
Specifications
Common questions
Can the kisimixer be used for a shower or a dog wash?
The title says shower system and basin. UK reviews describe a mini shower, an outside dog wash, a side shower and a bidet sprayer. Those are uses in the file, not a scheme certificate.
What stop is printed?
The bullets say 38°C, up to 42°C with the red button, and a mixed range of 35–45°C. The specification field says CE only.
Will it screw straight onto a tap?
One UK review says it needs fitting pipes and will not go straight onto the tap. The bullets describe 1/2 inch BSP pipe connections, not tap tails.
The Bohaner 04-502 is a compact inline valve, about 115 mm high and 300 g, on G1/2 BSP, and the listing says the thread is unsuitable for 3/4 inch pipe. The factory setting is around 38°C, and the red button is described as going up to about 50°C, which sits higher than the 42°C stops printed for the Coleniny and the kisimixer. A bullet says that if the cold supply fails the valve helps reduce sudden hot scalding, and no volume is stated for that claim. The listing line is 4.4 from 18 reviews. The file holds three short UK texts, all positive, including one that mentions three installs with no comebacks. That sample cannot show a second year of use, and no TMV standard is named. At £16.89 it is a small G1/2 blender for a 15 mm outlet you will set with a thermometer, and the about-50°C button is the reason to keep it off a bath that has a legal cap.
Pros
Cons
Best for: A 15 mm basin or shower run where you want a small body and you will set the outlet with a thermometer.
Less suitable: 3/4 inch pipe, a care bath, or any outlet that needs the override capped at 42°C.
Specifications
Common questions
Will Bohaner fit 3/4 inch pipe?
No. A bullet says the thread is G1/2 BSP / DN15 / 15 mm and is not suitable for 3/4 inch pipes. Overall size is about 115 mm high and 65 mm wide.
How high can the button go?
The bullets say a factory setting around 38°C and a red button up to about 50°C. That 50°C figure is a listing claim. No TMV2 or TMV3 mark is printed.
What do the reviews say?
The listing line is 4.4 from 18. The file has three short UK texts, all positive, including three installs with no comebacks. That sample cannot show durability.
The gold Tremax is a 460 g inline blender on a G1/2 British straight thread, with a centigrade scale and a lead-free brass claim. The bullets set a cold inlet of 4–29°C, a hot inlet of 50–95°C and an outlet of 20–50°C, and you press a red button to go past 38°C. The listing line is 4.3 from 428 reviews, and the sampled texts match the grey Tremax file, so this is one pool sitting on two colours. Themes in that pool include failures inside six months. The specification names BS EN 1074-1 and BS EN 1074-2, a different standard from TMV2 or TMV3. The maximum-pressure field prints 0.5 kPa, which is not a credible mains figure, and no fail-safe volume is stated. At £22.99 it costs more than the Coleniny and the kisimixer without a separate body of UK evidence, so it suits you if you want this gold finish and you will check the outlet with a thermometer.
Pros
Cons
Best for: An ordinary shower or basin blend when you specifically want the gold finish and you will not count the 428 reviews twice.
Less suitable: A care bath or a new-dwelling sign-off, and any buyer who reads BS EN 1074 as TMV2.
Specifications
Common questions
Does the gold Tremax state a shower use?
The title calls it a shower mixer valve with a 1/2 inch G connector. A UK review describes it on a shower. The listing does not state TMV2 or TMV3.
What temperature range is printed?
The bullets say a cold inlet of 4–29°C, a hot inlet of 50–95°C, and an outlet of 20–50°C. Over 38°C needs the red button. No fail-safe volume is stated.
Which standard is named?
The specification field says BS EN 1074-1 and BS EN 1074-2. It does not say BS EN 1111 or BS EN 1287. The ports field says 1, and the maximum pressure field says 0.5 kPa.
The grey Tremax is a 450 g inline blender at £23.99, with the same bullet temperatures as the gold listing: cold 4–29°C, hot 50–95°C, outlet 20–50°C, and a red button past 38°C. The listing line is again 4.3 from 428, and the first review texts match the gold file. You are reading one evidence pool a second time, including failures inside six months, rather than a fresh durability test. The specification block is where the colours diverge: this file prints 10 bar, a ports field of 1, and the words BS and CE. The gold file prints 0.5 kPa and BS EN 1074, so those two pressure figures stay on their own colours. Neither block names TMV2, TMV3, BS EN 1111 or BS EN 1287, and no fail-safe volume is stated. The grey body is a finish choice once you have already accepted the shared review file.
Pros
Cons
Best for: The grey finish of this blender, after you have read the gold file as the same evidence.
Less suitable: Anyone adding 428 and 428 into 856 reviews, or a buyer who needs a stated TMV2 or TMV3 mark.
Specifications
Common questions
Is the grey Tremax a separate review set?
The listing line is 4.3 from 428, the same count as gold ASIN B08ZMRPYGL, and the first review texts match. Treat them as one pool.
What pressure does this colour print?
The specification field says 10 bars. The gold file’s field says 0.5 kPa. Do not average them. The bullets do not state a pressure.
Which scheme mark is stated?
The specification field says BS and CE. It does not name TMV2, TMV3, BS EN 1111, or BS EN 1287.
The Rankomu is a 320 g inline three-port valve on G1/2, and the £15.99 shelf price is the lowest in this set that still prints a temperature stop. The bullets centre on 38°C ±2°C with a safety lock to 42°C, and they claim an automatic hot-water block above 42°C, though no test volume is given. The title’s 11.67 litres per minute is a title claim, and the file does not show a measured flow. The listing line is 4.3 from 30 reviews. Only one of 15 texts in the file is from the United Kingdom, and that review calls the scale readable, the fit straightforward, and notes a cold-only setting. A bullet says the valve complies with UK safety standards, while the specification field lists ASSE, NSF and UPC, without TMV2, TMV3, BS EN 1111 or BS EN 1287. For an ordinary basin or shower where you want a printed stop and a low shelf price, this is the best value in the set. The single UK text is a thin sample, and a care bath still needs a scheme this listing does not state.
Pros
Cons
Best for: An ordinary G1/2 shower or basin blend when the budget is near £16 and a printed stop matters more than a large UK review file.
Less suitable: A care bath, a new-dwelling Part G sign-off, or a buyer who reads the UK-safety-standards bullet as a TMV2 certificate.
Specifications
Common questions
Does Rankomu name a UK TMV scheme?
A bullet says it complies with UK safety standards. The specification field lists ASSE, NSF and UPC. TMV2, TMV3, BS EN 1111 and BS EN 1287 are not named.
What stop temperature is printed?
The bullets say 38°C ±2°C with a safety lock to 42°C, and an automatic hot-water block if the temperature exceeds 42°C. No test volume is given. The title’s 11.67 L/min is a title claim.
Is there a UK review?
The listing line is 4.3 from 30. Of 15 texts in the file, one is from the United Kingdom and calls it solid, readable and easy to fit, with a cold-only setting.
The GETSHOWERSET 2WAY-LEDSV-1 is a concealed two-way shower valve weighing 2.49 kg, with water-powered LED knobs that the listing says need no batteries. The outlets can run together, the connection is a UK 1/2 inch G1/2, and the bullets claim five years of limited support. At £179.99 it is the only high shelf price in this set. The saved listing has no customer-review line, so there is no star rating to weigh. A 38°C stop, a mixed range and a fail-safe test are all unstated, and no TMV standard is named. What you can see is a shower valve in three pieces, dimensions 27.9 × 20.3 × 15.2 cm, in a brushed-gold finish with a stainless-steel panel claim. It suits you when that concealed finish is the point of the purchase and you will commission the outlet with a thermometer, because the file gives you no temperature evidence to stand on.
Pros
Cons
Best for: A concealed brushed-gold shower where the finish and the two outlets are the reason to buy, and you will set the temperature with a thermometer.
Less suitable: Anyone who wants buyer reviews, a printed stop, or a scheme mark before spending £179.99.
Specifications
Common questions
Does this concealed valve state a safety stop?
No. The bullets describe LED knobs, simultaneous outlets, a 1/2 inch connection and a five-year support claim. They do not state 38°C, a mixed range, or a fail-safe test.
What is included?
Included components: shower valve. Number of pieces: 3. Weight 2.49 kg. Dimensions 27.9 x 20.3 x 15.2 cm.
Are there amazon.co.uk reviews in the saved listing?
No customer-review line is present, so the rating is not stated. Price in the saved listing is £179.99. No TMV2 or TMV3 mark is printed.
Nine amazon.co.uk listings are on this page: seven inline bodies, one exposed shower bar and one concealed shower valve. Three further saved listings were set aside because they were an EN 215 radiator valve, a ratio mixer whose reviews say it is not thermostatic, and a globe-style hot/cold switch. The order follows the listing evidence below. This is not a laboratory test, and a star rating is not a fail-safe test.
Job and scheme
30%A new-dwelling bath in England, a care outlet, and a basin or dog wash are different purchases. None of these listings states TMV2 or TMV3.
Fail-safe and stop
25%A printed 38°C button is not a cold-water isolation test. Listings that name a stop, and those that do not, are separated here.
Form and connections
20%An inline three-port body, an exposed shower bar and a concealed valve are not interchangeable. Thread and the printed hot-inlet range have to match the pipe and the cylinder.
Review evidence
15%amazon.co.uk star lines and the sampled UK texts are used as written. The two Tremax colours are one review pool, not two.
Shelf price
10%Prices are the amazon.co.uk shelf figures in the kept files, in GBP. They are not a quote for a scheme-certified valve or for installation.
Shoppers in this set are mostly choosing a small inline brass valve, an exposed shower bar, or one concealed shower valve. A householder who can feel the heat can use that list for a basin, a bidet spray or a dog wash. A fitter choosing a household shower bar is in a different row of the table. Entry prices in the kept files are £12.69 to £18.99, the mid band is £22.99 to £35.91, and the only high price is £179.99.
A thermostatic mixing valve blends hot and cold water and holds the mixed outlet near a chosen temperature. In a UK home the hot store is kept hot on purpose. HSG274 says store hot water at 60°C or above and aim for 50°C at outlets within a minute, with the blend close to the outlet and TMV strainers cleaned at least annually. BEAMA and Reliance describe a two-metre blended leg as a hygiene limit. The water that touches you is a separate limit.
A valve that says thermostatic can still be an EN 215 radiator valve. That product does not blend a bath or shower outlet. One saved listing was set aside for that reason. The note on a [thermostatic mixing valve or a radiator valve](/hub/medical-protection/blog/thermostatic-mixing-valve-or-radiator-valve) is the place to separate the two.
BS EN 1074, CE, ASSE, ASME and a printed 38°C button are not TMV2 or TMV3. NSF defines those schemes against BS EN 1111, BS EN 1287 and D08. None of the nine listings states either scheme.
The gold and grey Tremax listings both show 4.3 from 428, and the sampled texts match. That is one pool on two finishes, including failures inside six months. Adding 428 and 428 does not make 856 separate tests.
Decide the outlet before you compare star ratings. A basin, a bidet spray or a dog wash, used by someone who can feel heat and will notice a failure, is a household blender. An exposed shower bar and a concealed two-way valve are shower fittings, not inline service valves. A new-dwelling bath in England is Requirement G3(4), capped at 48°C, and only when a dwelling is erected or formed by a material change of use. The Part G FAQ says a new bathroom in an existing dwelling is not that trigger.
Approved Document G describes a blend that does not discharge above the maximum. A printed 38°C button is not a cold-water isolation test. Coleniny and kisimixer print 38°C, then 42°C only with the red button, and a mixed band of 35–45°C. Rankomu prints 38°C ±2°C with a lock to 42°C. Bohaner’s button is described as about 50°C. Wincal and the GETSHOWERSET state no stop. Zamery prints a 38°C lock on an exposed bar.
Three typical situations, each with a recommendation from this comparison.
You can feel the heat and you want the largest inline review file in this set. The Coleniny CN607 prints a 38°C stop and a 35–45°C mixed band. One UK review still reports about 70°C after repeated failures, so you check the outlet yourself.
You want a wall-mounted bar with one handle for flow and one for temperature, plus a 38°C lock. The Zamery is that form. Eight reviews is a thin file, and the listing does not state TMV2 or TMV3.
You want a G1/2 inline valve near £16 that still prints a 38°C stop and a lock to 42°C. The Rankomu is that listing. Only one of 15 sampled texts is from the United Kingdom, and the UK-safety bullet does not name a TMV scheme.
The top pick is Coleniny CN607, with the highest score in this comparison (9.1 out of 10, from 87 amazon.co.uk reviews). The Rankomu is the best value when you want a printed stop near £16 on an ordinary G1/2 blend. Neither listing, and none of the other seven, states TMV2 or TMV3. A care outlet or an England new-dwelling bath that must be signed off needs a scheme route this set does not show.
Rankomu Rankomufmv79gowcg
Lowest shelf price in this set that still prints a 38°C stop and a lock to 42°C, at £15.99.
Editorial
Products Compared publishes British-English buying guides based on amazon.co.uk listings and public UK sources. We do not run a lab and we do not invent test scores.
Guides on what to look for, how to use a product, and common mistakes.
Public UK sources named for this comparison. Updated 16 October 2026.
Expert source (DIY & tools): Charlie White (Charlie DIYte) (external profile) – public expert commentary used as a research source, not as a contributor to our pages.
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, star ratings and review counts come from those listings and from the public UK sources below. We did not run a laboratory test.
