The best Oventrop thermostats, compared.
Top pick: Oventrop Uni LH anthracite Best value: Oventrop Uni XH – Lowest shelf price among M30 x 1.5 heads with a zero setting on the listing, about £11.00. No UK review count on that listing. Updated October 2026.
An Oventrop thermostat here is a thermostatic radiator valve head or a boxed hydronic control for UK central heating, not a mains room stat. This comparison keeps nine amazon.co.uk listings: x 1.5 heads ( LH and XH), an x 1.0 L, clamp heads for RA and, and two products. Check the valve interface first, then a zero setting or frost mark where the listing states it, and the UK review line. EN 215 on a listing is a compliance marker, not proof a DIY swap matches your system design. A head on the wrong body can leak. Thread and clamp families are set out in the [Oventrop thermostat buying guide](/hub/thermostats/oventrop-thermostat/sub/oventrop-thermostat-buying-guide). On amazon.co.uk the nine listings are mostly screw-on heads or clamp variants, not mains-powered room stats.
An Oventrop thermostat here is a thermostatic radiator valve head or a boxed hydronic control for UK central heating, not a mains room stat.
32 products checked · 58 hrs invested · +18,600 readers
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Personal buying guide
Question 1 of 2
What is on the valve body now?
The anthracite Uni LH lists M30 x 1.5 and a liquid sensor at £27.81, roughly double the white zero-setting Uni LH in this batch. One UK review yields a 5.0 average, which is not a meaningful sample for reliability or noise complaints. The listing does not state zero setting or frost features for this finish variant, unlike the white zero model’s bullets. Choose it when the room scheme needs a charcoal cap and the thread is already known good; do not assume feature parity with the cheaper white LH ASIN.
Pros
Cons
Best for: You already know M30 x 1.5 fits and want a charcoal Oventrop cap rather than the white zero model.
Less suitable: Budget refreshes, buyers who need zero setting confirmed on the listing, or clamp valves.
Specifications
Common questions
Is B00OTUEEY0 the same as the white Uni LH?
It shares the Uni LH name and M30 x 1.5 thread in the title but lists a charcoal colour and a higher price than the white zero-setting head in this batch.
Does the anthracite Uni LH have a zero setting?
The listing does not state a zero setting for this ASIN.
Will it fit the same radiators as B00BB8A7VM?
Both list M30 x 1.5 in the title, but only B00BB8A7VM includes the long manufacturer compatibility list on the listing.
The Oventrop Uni LH with zero setting screws onto M30 x 1.5 radiator valve bodies and covers a 7–28 °C range on the amazon.co.uk listing. At £11.75 it carries 4.8 stars from nine UK reviews, which is the strongest feedback in this batch for a direct-thread head. The listing names a long compatibility list of radiator brands and cites EN 215, which helps when you are replacing a stuck dial on a wet system. UK reviewers describe a straightforward head swap rather than a smart heating upgrade. Amazon category fields mention batteries and ZigBee on some mechanical listings; treat those as noise unless the live bullets confirm them. You still need to confirm M30 x 1.5 on your existing body before ordering, because clamp-only valves will not take this thread.
Pros
Cons
Best for: You have verified M30 x 1.5 on the valve body and want a white head with zero shut-off and the best-documented UK review file in this comparison.
Less suitable: Danfoss RA or Vaillant clamp valves, M30 x 1.0 bodies, or a charcoal finish without checking the anthracite listing.
Specifications
Common questions
Does the Oventrop Uni LH B00BB8A7VM fit any radiator?
The listing limits compatibility to valve bodies or integrated distributors with an M30 x 1.5 thread and names many radiator brands. It is not a universal clamp head for Danfoss RA or Vaillant bodies without the correct thread.
Does this Uni LH have a zero setting?
The title and bullets state a zero setting with a 0 x 1–5 scale cap and a 7–28 °C range.
Is the B00BB8A7VM a smart or battery thermostat?
UK reviews describe a simple mechanical head. Amazon category fields mention battery power and ZigBee, which contradict the product type; treat those fields as listing noise unless confirmed on the live page.
The Uni L targets the less common M30 x 1.0 thread, not the 1.5 pitch used on most Uni LH listings in this comparison. At £13.54 the listing claims EN 215 compliance, frost protection, and a memo disc for setpoint limiting. Amazon.co.uk shows 4.5 stars from only two reviews, so the star line is thin evidence for how the disc behaves in a cold hallway. If your old head is labelled 1.0 or you measure a finer thread, this ASIN is the relevant family member; forcing a 1.5 head will not seal. Frost protection on the bullets is a comfort feature for part-time heated rooms, not a substitute for system antifreeze where your installer specifies it.
Pros
Cons
Best for: You have confirmed M30 x 1.0 on the valve and want frost protection plus memo-disc limiting in one Oventrop head.
Less suitable: Standard M30 x 1.5 manifolds, Danfoss RA clamps, or buyers who need a large UK review sample.
Specifications
Common questions
Is the Uni L the same thread as Uni LH?
The listing specifies M30 x 1.0 for this head, whereas Uni LH models in this comparison use M30 x 1.5. Mixing threads will not seal correctly.
Does B004HVN3ZW include frost protection?
The bullets state frost protection. The listing questions are unanswered.
What is in the box for the Uni L?
Included components listed: liquid sensor, frost protection feature, and memo disk.
Uni LV fits Vaillant clamp bodies on the title and bullets, with a 7–28 °C range and zero setting claimed at £27.53. Amazon.co.uk shows 3.8 stars from five UK reviews, the lowest star line among heads with any review count here. A listing question asks whether the clamp connector is included; it remained unanswered on the listing, so check the box contents on the live page before a job visit. Vaillant-specific clamps cost more than generic M30 heads; that premium only makes sense when the body brand is confirmed.
Pros
Cons
Best for: You have Vaillant clamp valve bodies and need an Oventrop head matched to that interface.
Less suitable: Danfoss RA, plain M30 threads, or budget-first shopping on generic radiators.
Specifications
Common questions
Is Uni LV only for Vaillant radiators?
The title and bullets state suitability for Vaillant with a clamp connector.
Does B004VEPLDM ship with the clamp?
A listing question asks whether a clamp connector is included. It is unanswered on the listing, so check the live box contents.
What range does Uni LV control?
Bullets state a 7–28 °C setpoint range with a 0 x 1–5 scale cap.
Uni XH is another M30 x 1.5 liquid-sensor head with a 7–28 °C range and zero setting on the listing, at £11.00 the lowest shelf price among direct-thread heads in this comparison. The listing had no UK review count or star line, so you are buying on listing claims and manufacturer documentation rather than buyer feedback. Oventrop documentation quotes different hysteresis figures for XH and LH series; this page only uses fields visible on amazon.co.uk. For a straight refresh where the thread is already verified, the price gap against the white Uni LH zero head is modest but real. If you need a named compatibility list in the product text, the Uni LH zero listing is more verbose.
Pros
Cons
Best for: You have already confirmed M30 x 1.5 and want the cheapest listed Oventrop screw-on head with zero on the scale.
Less suitable: Shoppers who rely on UK review volume, clamp valves, or Unibox RTL work.
Specifications
Common questions
What is the difference between Uni XH and Uni LH?
Both listings show M30 x 1.5 and a 7–28 °C range with zero setting on the XH. Manufacturer documentation quotes different hysteresis values for XH and LH; this comparison only uses amazon.co.uk listing fields.
Does the Uni XH need batteries?
The listing states batteries are not required.
Will Uni XH fit my existing TRV body?
The listing does not name radiator brands. You need an M30 x 1.5 valve thread or an integrated distributor with the same thread.
Uni XD is a clamp head for Danfoss RA valve bodies rather than an M30 screw-on fit, priced at £11.25 in the batch. The listing describes a liquid sensor and zero on the scale for summer shut-off when the clamp engages correctly on the RA pattern. There is no review data on the listing, and temperature range fields were unreliable. If your radiators still use Danfoss RA inserts, this is the Oventrop route in the comparison instead of adapting an M30 LH head.
Pros
Cons
Best for: Radiators with Danfoss RA valve inserts where you want an Oventrop dial without changing the body.
Less suitable: M30 x 1.5 or Vaillant clamp valves, or jobs that need review-backed evidence.
Specifications
Common questions
Can I fit Uni XD without a Danfoss RA valve?
The title and bullets target Danfoss RA clamp bodies. Other valve types need a different head or adapter.
Is Uni XD an M30 x 1.5 head?
The listing describes a clamp connector, not an M30 x 1.5 thread.
Does B004VEPRMM include an adapter?
The listing says connection or clamp connector but does not list separate adapter parts. Box contents are not stated.
Uni SH is listed as a plastic-bodied head with a 7–28 °C range and 0 x 1–5 scale cap in the title, at £13.56 mid-band for this batch. The listing did not state connection type, UK reviews, or memo-disc features, which makes compatibility shopping harder than on the Uni LH listing. The plastic material may matter in knocked-about halls or rented flats where metal caps get abused, but there are no review texts describing long-term durability here. Treat thread fit as unknown until you read the live listing or measure the body you have.
Pros
Cons
Best for: You want a lighter plastic cap and can confirm thread fit on the live amazon.co.uk page before buying.
Less suitable: Danfoss or Vaillant clamp systems, or anyone who needs EN 215 and reviews on the same listing.
Specifications
Common questions
Is the Uni SH metal or plastic?
The Amazon technical details field lists plastic.
What temperature range does B004VEQ4U6 cover?
The title states 7–28 °C with a 0 x 1–5 scaled cap.
Does Uni SH use a memo disc?
The listing does not mention a memo disc.
Unibox RTL Vario is a boxed return-temperature limiter at £80.75 and about 1.2 kg, not a radiator dial replacement. The listing describes RTL hydraulics in a Unibox assembly rather than a screw-on TRV head for a bedroom. No UK reviews appear on the listing, and boiler compatibility is not stated. Installers specify RTL where return temperature control is part of the system design; homeowners refreshing a single TRV should stay with head products in the main comparison.
Pros
Cons
Best for: Heating engineers adding RTL control where the system design calls for a Unibox limiter.
Less suitable: Replacing a bedroom TRV dial on an existing M30 or clamp body without hydraulic redesign.
Specifications
Common questions
Is Unibox RTL a radiator TRV head?
The listing describes return temperature control in a Unibox, not a screw-on TRV head for a radiator.
Does B085WFHGWY include an installation kit?
A listing question asks about an installation kit. It is unanswered on the listing.
Can I use RTL Vario on any boiler?
The listing does not state boiler compatibility.
Unibox plus bundles thermostat valve and RTL valve hardware for single-room control at £130.75, the highest price in the batch at 1.52 kg shipped weight. It is a panel kit, not a drop-in substitute for swapping an M30 head on an existing body. Parts lists and manual answers were incomplete on the amazon.co.uk listing. Use it when you are quoting a room package with RTL, not when you only need a new dial on a known valve.
Pros
Cons
Best for: Installers specifying a single-room Unibox plus package with both TRV and RTL elements.
Less suitable: Homeowners who only need to replace a stuck radiator dial.
Specifications
Common questions
What is included in Unibox plus B085WGRN9J?
The title names a thermostat valve and an RTL valve. A detailed parts list is not stated on the listing.
Is this a replacement for a TRV head only?
It is a boxed single-room control kit, not a drop-in head for an existing M30 body alone.
Does the listing include a manual?
A listing question asks about a manual. It is unanswered on the listing.
Scores use the nine amazon.co.uk listings in this comparison and the review notes already on file. Shelf date 19 October 2026. This is not a lab test. EN 215 on a listing is a compliance marker, not proof a DIY swap meets system design. Weights sum to 100. The highest score among TRV heads with usable UK review evidence is the top pick. The lowest shelf price among M30 x 1.5 heads with a zero setting on the listing and a complete thread claim is best value. Unibox products are not scored as radiator dial replacements. A 5.0 from one review is not scored above 4.8 from nine.
Valve fit clarity
35%Correct interface stated on the listing: M30 x 1.5, M30 x 1.0, Danfoss RA clamp, Vaillant clamp, or Unibox RTL, plus any compatibility detail the page actually gives.
Amazon evidence
30%Star rating on amazon.co.uk, then a hard deduction when the count is missing or in single digits. A 5.0 from one review is not scored above 4.8 from nine.
Control features
20%Zero setting, frost protection, memo disc, or RTL function where that product type needs it. A feature is counted only when that ASIN states it.
Value
15%Shelf price in GBP against fit evidence. The lowest price does not win when the review count is zero and the listing is sparse.
Match the head to the valve you already have. M30 x 1.5, M30 x 1.0, Danfoss RA clamp and Vaillant clamp are different parts. A Unibox is a return-temperature product, not a bedroom dial.
Oventrop sells thermostatic radiator valve heads and boxed hydronic controls for UK central heating. On amazon.co.uk the nine listings are mostly screw-on heads or clamp variants, not mains-powered room stats. They mix M30 x 1.5 heads (Uni LH and Uni XH), an M30 x 1.0 Uni L, a Danfoss RA clamp (Uni XD), a Vaillant clamp (Uni LV), and two Unibox products. Fit comes first: a well-made head on the wrong body still wastes money and can leak.
The threads look similar. A Uni L will not fit a 1.5 body, and a Uni LH will not seal on a 1.0 body. Read the pitch on the old head before you order.
Battery, ZigBee or 230 V fields appear on mechanical heads. Check the bullets and the manufacturer sheet. Those category fields are not a smart-thermostat claim.
RTL kits are not drop-in TRV replacements. Use a head when you only need a new dial, and a Unibox when return temperature is part of the design.
The first check is the interface on the valve you already have. M30 x 1.5 is the direct thread on Uni LH, Uni XH and the anthracite Uni LH. M30 x 1.0 is the Uni L only. The pitches look similar, and a 1.0 head will not seal on a 1.5 body. Danfoss RA uses the Uni XD clamp. Vaillant uses the Uni LV clamp. The listing should name that interface. A long radiator-brand list, as on the white Uni LH, is more useful than a title that only says thermostat.
Once the thread or clamp matches, read the control marks on that ASIN, not on a sibling. Zero setting is the summer shut-off. It is stated on the white Uni LH, Uni XH, the Uni SH title, Uni XD and Uni LV. It is not stated on the anthracite Uni LH. The white Uni LH zero head states 7–28 °C. The anthracite listing does not print that range. Frost protection is claimed on the Uni L bullets, for rooms that are only heated part of the time.
Three typical situations, each with a recommendation from this comparison.
You want a direct M30 x 1.5 replacement with minimal tools. The white Uni LH is the best-documented fit in this batch: zero setting, EN 215 on the listing, and 4.8 from nine UK reviews at about £11.75. Confirm the thread on the body before you order.
A Danfoss RA body needs the Uni XD clamp head, not an M30 screw-on. It is about £11.25, with a liquid sensor and zero on the scale, and no UK reviews on the listing. A Vaillant clamp is a different part, the Uni LV.
Unibox listings are for return temperature limiting, not a consumer dial. RTL Vario is about £80.75, with no UK reviews on the listing. It is not a swap for a stuck bedroom head.
The top pick is the Oventrop Uni LH with a zero setting, about £11.75, score 96. It is an M30 x 1.5 head with EN 215 on the listing and 4.8 from nine UK reviews, the strongest review file among direct-thread heads here. Best value is the Oventrop Uni XH at about £11.00, a different ASIN, with M30 x 1.5 and a zero setting stated, and no UK reviews on that listing. Skip both if the body is Danfoss RA, Vaillant clamp, or M30 x 1.0, or if the job is a Unibox rather than a radiator dial.
Oventrop Uni XH
Lowest shelf price among M30 x 1.5 heads with a zero setting on the listing, about £11.00. No UK review count on that listing.
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 and manufacturer sources named below. amazon.co.uk prices, stars and review counts on these nine listings were read on 19 October 2026. Page updated October 2026.
This page contains affiliate links to amazon.co.uk (tag pcuk26-21). If you buy through them, we may earn a commission at no extra cost to you. Prices, stars and review counts are taken from those listings. We did not run a lab test.
