Heimeier thermostat buying guide

Updated: October 2026

You are looking at a cold radiator and a white head that no longer moves, and the amazon.co.uk grid is offering Heimeier parts that only look interchangeable.

You are looking at a cold radiator and a white head that no longer moves, and the amazon.co.uk grid is offering Heimeier parts that only look interchangeable. Separate three facts before the price: the piece that has failed, the thread on the valve, and the article number on the box. Pipe size is not the head thread, and a Wi-Fi line on a mechanical listing is not a second product. Prices sit on the Heimeier thermostat comparison. This page is the order of the choice. Listings were captured on 15 October 2026. We did not run a lab test. A qualifying purchase through our links can earn a commission at no extra cost to you.

Our top picks

Badge	Product	Connection	Part	Scale	Note	Price	Offer
Best overall	Sanitop-Wingenroth Heimeier K, Danfoss RAVL	Danfoss RAVL	Thermostatic head	6–28 °C, marks 1–5	9.0	about £22.75	View offer
Preis-Tipp	Heimeier Heimeier K-Eco 6071-43.500	M30×1.5	Thermostatic head	16 °C / Eco 20 °C / 24 °C	5.0	about £19.00	View offer
	Heimeier Heimeier V-exact II axial body	1/2 inch axial, DN 15	Valve body	Not stated	5.0	about £19.39	View offer

Best overall

Sanitop-Wingenroth Heimeier K, Danfoss RAVL

9.0/10about £22.75

View offer

Preis-Tipp

Heimeier Heimeier K-Eco 6071-43.500

5.0/10about £19.00

View offer

Rank 3

Heimeier Heimeier V-exact II axial body

5.0/10about £19.39

View offer

On this page

1.Head, valve body, or thermostat top
2.M30×1.5, and the names that are not M30
3.K-Eco or a numbered dial
4.What the amazon.co.uk set is actually selling

Head, valve body, or thermostat top

Start with the part in your hand. A thermostatic head is the dial that senses the room and pushes a pin. A valve body is the metal part the pipe joins, and it stays on the radiator when you only change the dial. A thermostat top, here, is an insert with cam identification, not a numbered temperature scale you set to 3. If the pin springs and the radiator then heats, UK pin-test guides treat that as a head fault, and you do not drain the house to change the dial. If the pin stays down, or the radiator stays cold with the head off and the pin free, the body is the suspect. Once water, a gland, or an olive is involved, that is an engineer’s job. The V-exact II, article 3710-02.000, is an axial DN 15 (1/2 inch) body at about £19.39. The bullet says nickel-plated gunmetal, and the box does not include a head. The thermostat top 2001-02.300, at about £15.60, names DN 10 and DN 15 and is not a K dial.

M30×1.5, and the names that are not M30

M30×1.5 is the thread many Heimeier heads use on the insert. It is not a 15 mm pipe. DN 15 is the body size on the V-exact listing. You can have a 15 mm pipe and still have a Danfoss collar that will not take an M30 nut. IMI’s English heads overview splits ordinary M30×1.5 heads from direct heads for Danfoss RA, RAV, RAVL, and Vaillant. The K-Eco 6071-43.500 prints M30×1.5, at about £19.00, with frost protection and no review line. The head at about £22.75 prints a Danfoss RAVL connection, not M30, and it carries 4.5 from 285 reviews. Article 9712-00.500 prints a direct connection for Vaillant, at about £29.67. The HEIMFF head at about £14.51 does not print a thread, and the manufacturer line says Conmetall. Collar sizes for RA, RAV, and RAVL are on the Heimeier vs Danfoss thermostat page. A standard Heimeier M30 head does not replace every Danfoss body, and a RAVL head is the wrong default on a plain M30 insert.

Testsieger

Sanitop-Wingenroth Heimeier K, Danfoss RAVL

9.0/10about £22.75

View offer

K-Eco or a numbered dial

Once the thread matches, the dial is the second decision. The K-Eco bullets print minus as 16 °C, Eco as 20 °C, and plus as 24 °C, with frost protection. IMI’s K-Eco datasheet states a 6–28 °C range for that article family. Use the figures on the listing. Do not pretend the Amazon bullet printed 6–28 °C when it printed three marks. A numbered 1–5 head, such as the RAVL listing’s 6–28 °C scale, gives more steps. IMI’s K sheet treats number 3 as about 20 °C in a climatic chamber, with about 4 °C between numbers. That is not a thermometer at the sofa. Setting the dial after the head is on sits on how to fit a Heimeier thermostat. Choose the K-Eco for a confirmed M30×1.5 insert when you can live with no reviews. It is the best value here because it is a specified M30 head at about £19.00. It is still the wrong head for a RAVL collar.

What the amazon.co.uk set is actually selling

The about £22.75 head is a liquid-filled K with a Danfoss RAVL connection. The brand field says Sanitop-Wingenroth, while the item type says a Heimeier thermostatic head K. It is a conditional top pick. The about £64.15 article 2805-00.500 is a remote adjuster with a 5 m capillary, and the about £58.92 article 6402-00.500 is a head with a heat-conducting base and 2 m in the title. Neither has a review line, and neither belongs on an open radiator in free air. Attribute grids also say Wi-Fi, Zigbee, Alexa, BACnet, a battery, or 230 V. Those lines conflict with the title and the box. Energy Saving Trust treats a thermostatic radiator valve as the room layer on top of a programmer and a room thermostat. This set does not come with a measured percentage saving.

Common questions

Is M30×1.5 the same as a 15 mm pipe?

No. M30×1.5 is a head thread. A 15 mm pipe, and DN 15 on the V-exact body, describes the pipe or valve body size. You can measure 15 mm copper at the radiator and still have a Danfoss clip collar, or an M30 insert, or a Vaillant direct connection. Read the collar or the old head before you treat 15 mm as the order.

How do I tell a head fault from a valve-body fault before I pay?

Take the old head off. If the pin springs back and the radiator then heats, the guides treat that as a head. If the pin stays down, or the radiator stays cold with the pin free, suspect the body. A weeping gland, a seized pin that needs force, or a new olive is the point where you stop and call someone, rather than ordering a second dial.

Will a standard Heimeier head fit a Danfoss valve?

Only when that Danfoss body is already an M30 insert. A standard M30 Heimeier head does not replace RA, RAV, and RAVL as a set. This comparison stocks one Heimeier-style direct head for RAVL, at about £22.75, and it does not stock Heimeier direct heads for RA or RAV. The collar sizes are on the versus page.

Why does the Amazon grid say Wi-Fi and 230 V?

Because the attribute grid on these listings has been filled with lines the title and the box do not support. The kept products are mechanical heads, a valve body, or a thermostat top. The Wi-Fi, Zigbee, Alexa, BACnet, and 230 V lines conflict with that. Ignore them when you choose, and use the connection and the article number instead.

Do I need a TRV in the same room as the wall thermostat?

Energy Saving Trust treats thermostatic radiator valves as the room-by-room layer, with the programmer and the room thermostat still doing the boiler control. A TRV in the thermostat’s own room can shut that radiator while the rest of the house is still calling for heat, or the reverse. Leave that room on a manual valve unless a heating engineer has set the controls up that way. No percentage saving is claimed for the ASINs on this page.

Best Heimeier thermostat head