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Underfloor heating actuator buying guide

Updated: October 2026

A cold loop usually means one white head on the manifold, and the amazon.co.uk results look almost the same. This underfloor heating actuator buying guide is the order of checks before you sort by price. You match the voltage the wiring centre sends to that zone, then normally closed or open, then thread and stroke, then the wires and the cable. The [underfloor heating actuator comparison](/hub/heating/underfloor-heating-actuator) is the grid of eleven listings. Products Compared updated this page in October 2026 from those listings and public UK notes. We did not run a lab test. A qualifying purchase can earn us a commission at no extra cost to you.

A cold loop usually means one white head on the manifold, and the amazon.co.uk results look almost the same. This underfloor heating actuator buying guide is the order of checks before you sort by price.

Our top picks

Wengart Wengart WG2208 Red Head 230 V

Best overall

Wengart Wengart WG2208 Red Head 230 V
7.2/10about £9.99
View offer
Wengart Wengart WG2208 Blue Head 230 V

Rank 2

Wengart Wengart WG2208 Blue Head 230 V
8.3/10about £10.99
View offer
RIMEX RIMEX ZL-2033 230 V Normally Closed Actuator

Alternative

RIMEX RIMEX ZL-2033 230 V Normally Closed Actuator
7.9/10about £12.95
View offer
On this page
  1. 1.Read the old head and the wiring centre before you look at price
  2. 2.Thread, collar, and stroke
  3. 3.Wires, time, and cable
  4. 4.What to ignore on a marketplace listing

Read the old head and the wiring centre before you look at price

The head you unscrew, and the label on the wiring centre, decide the next one. Voltage comes first. Warmhaus's selection guide says a 230 V head on a 24 V output stays shut, and a 24 V head on 230 V can burn out. In this amazon.co.uk set, every listing that states a voltage says 230 V. None is a clear 24 V model. The Heatmiser two-wire listing at £9.71 does not state a voltage at all. The second line is the fail position. A normally closed head stays shut until the room calls for heat. A normally open head stays open until something powers it shut. Both can still be 230 V. Read that fork on the normally closed or normally open page, and a mains-fed centre that still outputs 24 V on the 24V or 230V page. On Myson's 24 V sheet the centre plugs into 230 V, and the actuator terminals are 24 V, up to 12 heads at 2 W.

Thread, collar, and stroke

The Underfloor Heating Company says most manifolds are M30 x 1.5, and that you must not assume yours is. The nut on the old head is the measurement. Underfloor Store lists a VA10 ring for Uponor, Emmeti, Maincor, and Polypipe at £3.84 including VAT, and a different M30 collar for a longer brand list. If the new nut will not start by hand, stop. Stroke is the distance the pin travels. The VANCOCO packs and the Voltrique row say 3.0 mm. The RIMEX ZL-2033 says 4 mm. The Heatmiser TA230 datasheet states 3.5 mm, plus or minus 0.5 mm. That figure stays on the TA230 sheet. It does not come free with a VA10 adaptor. A nut that starts can still miss a short pin.
Wengart Wengart WG2208 Red Head 230 V

Testsieger

Wengart Wengart WG2208 Red Head 230 V
7.2/10about £9.99
View offer

Wires, time, and cable

A two-wire head has no end switch. The Underfloor Heating Company describes it as a small heater on the zone output. A four-core lead is a different circuit. Where these eleven listings state the wiring, they say two-wire. If the head you removed has four cores, this grid is the wrong shortlist. Where a time is printed, it falls between about two and five minutes. The RIMEX listing says about three minutes. The blue Wengart WG2208 says a controlled 3–5 minute cycle. The LavaTap TA230 listing says about 120–180 seconds. A room that is still cold at two minutes has not yet shown you a dead head. The RIMEX listing states a 0.5 m cable and the LavaTap TA230 listing states 1 m. Lay the old lead along the route before you order.

What to ignore on a marketplace listing

Leave the star line until the specification lines are filled in. The Heatmiser two-wire row does not state voltage or thread, and the model field reads THERMALACTUATOR. The Voltrique row prints 20 g, against the TA230 datasheet weight of 127 g, and it does not state normally closed or open. The VANCOCO five-pack states 230 V in the title and also carries a Low Voltage attribute. Those two voltage claims cannot both be the order. A 5.0 from two reviews, on the LavaTap TA230 row at £17.99, is a tiny sample, and a 4.4 from 168 still does not prove the thread on your rail. Fitting, including when the water stays in the system, is on the how to replace an underfloor heating actuator page.

Common questions

What should you match first, voltage or price?
Match voltage first, then fail position, thread and stroke, and the wires. The £7.69 Voltrique row still omits the fail position and the thread, so the cheapest listing is an unfinished specification.
Is M30 x 1.5 enough to know it will fit?
It is the thread you will often see, and it is not a guarantee. The nut can share an M30 x 1.5 label and still miss the pin. If the new ring will not start by hand, stop and compare it with the collar you took off.
Do UK wiring centres usually want normally closed?
Usually yes for room-by-room zoning, so a dead head leaves that loop cold. Match the mark on the old head. Both types are sold at 230 V.
Should you buy a two-wire or a four-wire actuator?
Match the lead you removed. A two-wire actuator is a load on the zone terminals. A four-core head also switches another circuit, and these listings are the wrong basket when the old head used that extra pair.
How long should a wax head take to open?
About two to five minutes where a time is printed. The TA230 datasheet says 120/180 seconds. Wait that out before you decide the head is dead. The room can stay cool for longer than the pin takes to move.
What cable length is worth looking for?
Measure the old lead. Many rows leave the length blank. A reviewer on the Wengart WG20 estimated about 80–90 cm and called that short.

Related pages

What an underfloor heating actuator does

Underfloor heating actuators

Read 24 V or 230 V on the underfloor heating actuator

Best underfloor heating actuator: 230 V, M30, closed

How to replace an underfloor heating actuator head

Normally closed or open underfloor heating actuator

Sources

Public UK sources and the amazon.co.uk listings in this comparison. Listings captured 15 October 2026. Page updated October 2026.

  1. Approved Document L, Volume 1 (2021, 2023 amendments) (retrieved 15 October 2026)
  2. Approved Document P (2013) (retrieved 15 October 2026)
  3. BEAMA underfloor heating controls guide (retrieved 15 October 2026)
  4. Heatmiser TA230 actuator datasheet (retrieved 15 October 2026)
  5. The Underfloor Heating Company: install an actuator (retrieved 15 October 2026)
  6. Warmup wiring centre manual (retrieved 15 October 2026)
  7. Grant UFLEX UH8 installation guide (retrieved 15 October 2026)
  8. Consumer Rights Act 2015 (retrieved 15 October 2026)