Thermostatic Radiator Valves (TRVs) — UK-Wide, Qualified & Priced Up Front
TRV supply, fitting & repair — handled UK-wide by qualified, insured local engineers, with the price agreed before work starts and honest advice on what your system actually needs.
Per-room control, cheaply
A thermostatic radiator valve holds its radiator's room at a chosen temperature by throttling flow as the room warms — simple wax-or-liquid sensor mechanics, no wiring, and the cheapest form of zoning a wet system can get. The practical payoff: bedrooms held cooler than living rooms without anyone touring the house twiddling valves, and rooms that overheat from sun or cooking automatically backing off. Current standards expect TRVs on most radiators in new and substantially modified systems — the room holding the main thermostat traditionally stays TRV-free or fully open so the two controls don't fight.
TRVs also fail in recognisable ways as they age: pins stick down after summer leaving radiators cold (often freed in moments), sensor heads lose calibration so '3' no longer means what it did, and gland seals weep. Replacement is quick, and whole-house refresh sets — every radiator re-valved in one visit — price keenly because the setup cost is shared. Fitting requires either draining down or freezing the pipework locally; both are routine, and the choice is the engineer's call on the day based on the system.
Standard vs smart, and honest numbers
Standard TRVs cost little and do the core job; smart TRVs add per-room scheduling from an app — bedrooms warming before the alarm, spare rooms heating only when guests exist. The honest split: larger homes with rooms used very differently extract real value from smart heads; compact homes with uniform use mostly don't, and the money is better spent elsewhere in the system. Mixed fits — smart heads on two or three key rooms, standard elsewhere — are often the value sweet spot.
Per-valve pricing runs from around £60 fitted for standard valves to £90–£140 for smart heads on existing TRV bodies, with whole-house sets quoted as a package. The savings claims deserve honesty too: TRVs trim waste rather than transform bills — the transformation stories usually belong to homes that previously had no controls at all. What they reliably deliver is comfort control per room, which is worth having on its own terms.
| Item | Guide |
|---|---|
| Typical price band | £60–£250 |
| Pricing basis | fixed per-valve pricing; whole-house sets priced keenly |
| Typical timescale | 1–2 hours |
| Funnel | Attendance and diagnosis |
| Credentials | Qualified heating engineer |
Frequently asked questions
My radiator with a TRV stays cold — is the valve broken?
Often it's just the pin stuck down after the summer off-season — a common, quickly freed fault. If the pin moves and the radiator still won't heat, the head or body may need replacing, or the system may need balancing. All quick diagnoses.
Can smart TRV heads fit my existing valves?
Frequently yes — most smart heads fit standard valve bodies with adapters. The engineer confirms compatibility per radiator; where bodies are too old or seized, replacing the body at the same visit is straightforward.
Should every radiator have a TRV?
Most should; the room with the main wall thermostat traditionally keeps a fully open or standard valve so the two controls don't fight each other. The engineer sets this up correctly as part of any whole-house fit.
Do TRVs need the system drained to fit?
Either a partial drain-down or local pipe freezing — both routine, chosen on the day by the engineer based on your system layout. Whole-house sets are usually done on one controlled drain-down, which is part of why package pricing is keen.