Get quotes to fit TRVs (thermostatic radiator valves)

HaMuch is Excellent
By Emily Rivers
Last updated 28th March 2023

A thermostatic radiator valve (TRV) is the valve on one side of a radiator that has numbered options for the desired heat in the room. Most TRVs can be fitted to either the flow or return (Danfoss RAS-C² are bidirectional angle valves) but it is best to fit to the flow when possible. Think of a TRV as an on / off tap allowing water into the radiator on demand. The numbers refer to the heat in the room and when the room temperature drops below the heat setting, the TRV will allow heat to flow through to the radiator to warm the room to the desired temperature.

0 = Off

* = 7°C

1 = 10°C

2 = 15°C

3 = 20°C

4 = 25°C

5 = 30°C

A lockshield valve is the valve fitted on the other side (normally the return side) of the radiator but like the Danfoss RA-FS valves they are also bi-directional.

How much will it cost to fit TRVs (thermostatic radiator valves)?

Replacing valves for TRVs in your home will be dependent on the amount of hours the heating engineer needs to complete the task as well as the cost of the TRVs. A good quality well known brand like Danfoss RAS-C² bidirectional angle valve can set you back £12 with it coming paired with a lockshield for as little as £18 from stores like Screwfix.

A self-balancing TRV, Danfoss RAS-B2 will cost a bit more from £23 as it is a more upmarket specialised TRV.

How much labour costs to fit a TRV

Per

Average cost

Replacing a valve with a TRV

Per hour 

£40

Upgrading for a new pair of TRV and lockshield

Per hour 

£60 

Replacing a valve with a self-balancing valve

Per hour 

£30

Replacing 5x TRVs

Per job

£160

Cost to fit TRVs (thermostatic radiator valves)

How do TRVs work?

The TRV is fitted to the side of the water flowing into the radiator. The valve will open and close to adjust flow of hot water into the radiator according to the temperature setting it has been set to.

The visible part of the TRV with numbers printed is referred to as the head and this sits on the valve body.  The TRV works by the valve head expanding or contracting depending on the temperature which in turn adjusts the pin of the valve head allowing more or less water to flow through the valve. An expanding valve due to a warmer room, pushes the pin down, allowing for less water flow in to the radiator which will result in less heat coming off the radiator, therefore the room will cool down and once this happens the valve head will no longer expand, releasing pressure from the pin, lifting the pin, for more water to enter the radiator, to warm the radiator and therefore warm the room until again it reaches the desired temperature with the valve body expanding.

TRVs or either wax or liquid models. Liquid TRVs are the modern valves (Danfoss do liquid sensor valves) and react quicker to heat changes than the older wax TRVs.

TRV vs Danfoss Self-balancing TRV

Now that we understand how TRVs work, what is the difference between a TRV and a self-balancing TRV like the Danfoss RAS-B2? Well, the self balancing valve is a 2-in-1 being even more energy efficient than a standard TRV as it acts as a temperature control and an automatic balancing valve.

Standard TRVs only limit the flow of water but Danfoss RAS-B2 have a differential pressure controller and the balance flow pre-setting saves labour costs by quickly and easily doing this on the TRV rather than on the lockshield. 

Do smart TRVs exist?

Some companies like Danfoss do smart electronic radiator thermostats (the Danfoss Eco™) where each individual room thermostatic radiator valve can be controlled via bluetooth on your smartphone in an app. This means even when you are not home, you can set an individual room to your desired heating. These TRVs are also able to be set manually for those moments where that might be easier.

Do I need to drain down my system to fit TRVs?

This depends on how many radiator valves are being changed. If you are wanting to upgrade your home to TRVs and looking to change a few radiator valves for TRVs then it will be easier to drain the water out of the heating system. Do not forget if draining down, when refilled to replenish your system with a central heating inhibitor to keep it protected from rust debris.

If you are replacing a faulty valve on one radiator, then best to change the TRV without draining down the entire system but rather releasing the pressure and draining down that radiator only. A gas engineer will be able to do this for you as it is a standard common job that they are used to doing in most homes due to replacing faulty valves or old leaky valves and upgrading older valves for modern TRVs.

Should I have TRVs on every radiator?

As TRVs can reduce the cost of energy bills, it is worth having them fitted to most rooms in the house to avoid paying for energy to heat rooms that are not used often. There should be one radiator in the home that is on permanently when the heating is switched on, without being heat adjusted by having a TRV attached to it.

Normally, people leave a bathroom radiator / towel rail without a TRV fitted to it or if there is a radiator near the thermostat, better to cleave that off from TRVs because a TRV on a radiator near the thermostat can leave the thermostat getting confused at whether it has reached temperature or not, and this might cause the thermostat to signal to the boiler to stay on longer giving and wasting more heat.


Estimates for common heating engineer jobs;

Rates for other trades

Fit thermostatic radiator valves, Danfoss RAS-C2 cost in the UK
Fit thermostatic radiator valves, Danfoss RAS-C2 cost in the UK (excluding VAT or callout charges)
Location in UKFit thermostatic radiator valves, Danfoss RAS-C2 cost
Fit thermostatic radiator valves, Danfoss RAS-C2 near Aberdeen£92
Fit thermostatic radiator valves, Danfoss RAS-C2 near Amber Valley£94
Fit thermostatic radiator valves, Danfoss RAS-C2 near Angus£86
Fit thermostatic radiator valves, Danfoss RAS-C2 near Arun£108
Fit thermostatic radiator valves, Danfoss RAS-C2 near Ashfield£92
Fit thermostatic radiator valves, Danfoss RAS-C2 near Aylesbury Vale£114
Fit thermostatic radiator valves, Danfoss RAS-C2 near Barnsley£90
Fit thermostatic radiator valves, Danfoss RAS-C2 near Basildon£108
Fit thermostatic radiator valves, Danfoss RAS-C2 near Basingstoke & Deane£132
Fit thermostatic radiator valves, Danfoss RAS-C2 near Bassetlaw£86
Fit thermostatic radiator valves, Danfoss RAS-C2 near Bath & North East Somerset£96
Fit thermostatic radiator valves, Danfoss RAS-C2 near Bedford£110
Fit thermostatic radiator valves, Danfoss RAS-C2 near Belfast£82
Fit thermostatic radiator valves, Danfoss RAS-C2 near Birmingham£94
Fit thermostatic radiator valves, Danfoss RAS-C2 near Blackburn£88
Fit thermostatic radiator valves, Danfoss RAS-C2 near Blackpool£90
Fit thermostatic radiator valves, Danfoss RAS-C2 near Bolton£94
Fit thermostatic radiator valves, Danfoss RAS-C2 near Bournemouth£102
Fit thermostatic radiator valves, Danfoss RAS-C2 near Bracknell Forest£130
Fit thermostatic radiator valves, Danfoss RAS-C2 near Bradford£88
Fit thermostatic radiator valves, Danfoss RAS-C2 near Braintree£106
Fit thermostatic radiator valves, Danfoss RAS-C2 near Breckland£86
Fit thermostatic radiator valves, Danfoss RAS-C2 near Bridgend£86
Fit thermostatic radiator valves, Danfoss RAS-C2 near Brighton£110
Fit thermostatic radiator valves, Danfoss RAS-C2 near Bristol£92
Fit thermostatic radiator valves, Danfoss RAS-C2 near Broadland£102
Fit thermostatic radiator valves, Danfoss RAS-C2 near Broxtowe£92
Fit thermostatic radiator valves, Danfoss RAS-C2 near Bury£94
Fit thermostatic radiator valves, Danfoss RAS-C2 near Caerphilly£84
Fit thermostatic radiator valves, Danfoss RAS-C2 near Calderdale£86
Fit thermostatic radiator valves, Danfoss RAS-C2 near Cambridge£106
Fit thermostatic radiator valves, Danfoss RAS-C2 near Canterbury£104
Fit thermostatic radiator valves, Danfoss RAS-C2 near Cardiff£86
Fit thermostatic radiator valves, Danfoss RAS-C2 near Carmarthenshire£70
Fit thermostatic radiator valves, Danfoss RAS-C2 near Charnwood£94
Fit thermostatic radiator valves, Danfoss RAS-C2 near Chelmsford£106
Fit thermostatic radiator valves, Danfoss RAS-C2 near Cheltenham£104
Fit thermostatic radiator valves, Danfoss RAS-C2 near Cherwell£108
Fit thermostatic radiator valves, Danfoss RAS-C2 near Chester£92
Fit thermostatic radiator valves, Danfoss RAS-C2 near Colchester£104
Fit thermostatic radiator valves, Danfoss RAS-C2 near Conway£80
Fit thermostatic radiator valves, Danfoss RAS-C2 near Coventry£94
Fit thermostatic radiator valves, Danfoss RAS-C2 near Crewe & Nantwich£92
Fit thermostatic radiator valves, Danfoss RAS-C2 near Dacorum£122
Fit thermostatic radiator valves, Danfoss RAS-C2 near Derby£92
Fit thermostatic radiator valves, Danfoss RAS-C2 near Doncaster£90
Fit thermostatic radiator valves, Danfoss RAS-C2 near Dover£108
Fit thermostatic radiator valves, Danfoss RAS-C2 near Dudley£96
Fit thermostatic radiator valves, Danfoss RAS-C2 near Dumfries & Galloway£82
Fit thermostatic radiator valves, Danfoss RAS-C2 near Dundee£96
Fit thermostatic radiator valves, Danfoss RAS-C2 near East Ayrshire£90
Fit thermostatic radiator valves, Danfoss RAS-C2 near East Devon£84
Fit thermostatic radiator valves, Danfoss RAS-C2 near East Dunbartonshire£98
Fit thermostatic radiator valves, Danfoss RAS-C2 near East Hampshire£104
Fit thermostatic radiator valves, Danfoss RAS-C2 near East Hertfordshire£116
Fit thermostatic radiator valves, Danfoss RAS-C2 near East Lindsey£84
Fit thermostatic radiator valves, Danfoss RAS-C2 near East Riding£88
Fit thermostatic radiator valves, Danfoss RAS-C2 near Eastleigh£104
Fit thermostatic radiator valves, Danfoss RAS-C2 near Edinburgh£100
Fit thermostatic radiator valves, Danfoss RAS-C2 near Elmbridge£132
Fit thermostatic radiator valves, Danfoss RAS-C2 near Epping Forest£126
Fit thermostatic radiator valves, Danfoss RAS-C2 near Erewash£92
Fit thermostatic radiator valves, Danfoss RAS-C2 near Exeter£88
Fit thermostatic radiator valves, Danfoss RAS-C2 near Falkirk£98
Fit thermostatic radiator valves, Danfoss RAS-C2 near Fife£94
Fit thermostatic radiator valves, Danfoss RAS-C2 near Flintshire£88
Fit thermostatic radiator valves, Danfoss RAS-C2 near Gateshead£100
Fit thermostatic radiator valves, Danfoss RAS-C2 near Gedling£92
Fit thermostatic radiator valves, Danfoss RAS-C2 near Glasgow£98
Fit thermostatic radiator valves, Danfoss RAS-C2 near Gloucester£150
Fit thermostatic radiator valves, Danfoss RAS-C2 near Guildford£128
Fit thermostatic radiator valves, Danfoss RAS-C2 near Gwynedd£72
Fit thermostatic radiator valves, Danfoss RAS-C2 near Halton£94
Fit thermostatic radiator valves, Danfoss RAS-C2 near Harrogate£86
Fit thermostatic radiator valves, Danfoss RAS-C2 near Havant & Waterloo£100
Fit thermostatic radiator valves, Danfoss RAS-C2 near Highland£94
Fit thermostatic radiator valves, Danfoss RAS-C2 near Horsham£122
Fit thermostatic radiator valves, Danfoss RAS-C2 near Huntingdonshire£100
Fit thermostatic radiator valves, Danfoss RAS-C2 near Ipswich£140
Fit thermostatic radiator valves, Danfoss RAS-C2 near Isle of Wight£100
Fit thermostatic radiator valves, Danfoss RAS-C2 near Kings Lynn & West Norfolk£92
Fit thermostatic radiator valves, Danfoss RAS-C2 near Kingston-upon-Hull£86
Fit thermostatic radiator valves, Danfoss RAS-C2 near Kirklees£88
Fit thermostatic radiator valves, Danfoss RAS-C2 near Knowsley£94
Fit thermostatic radiator valves, Danfoss RAS-C2 near Lancaster£90
Fit thermostatic radiator valves, Danfoss RAS-C2 near Leeds£88
Fit thermostatic radiator valves, Danfoss RAS-C2 near Leicester£92
Fit thermostatic radiator valves, Danfoss RAS-C2 near Lisburn£82
Fit thermostatic radiator valves, Danfoss RAS-C2 near Liverpool£92
Fit thermostatic radiator valves, Danfoss RAS-C2 near London£128
Fit thermostatic radiator valves, Danfoss RAS-C2 near Luton£120
Fit thermostatic radiator valves, Danfoss RAS-C2 near Macclesfield£90
Fit thermostatic radiator valves, Danfoss RAS-C2 near Maidstone£106
Fit thermostatic radiator valves, Danfoss RAS-C2 near Manchester£94
Fit thermostatic radiator valves, Danfoss RAS-C2 near Mid Bedfordshire£112
Fit thermostatic radiator valves, Danfoss RAS-C2 near Mid Sussex£120
Fit thermostatic radiator valves, Danfoss RAS-C2 near Middlesbrough£94
Fit thermostatic radiator valves, Danfoss RAS-C2 near Milton Keynes£112
Fit thermostatic radiator valves, Danfoss RAS-C2 near Neath Port Talbot£90
Fit thermostatic radiator valves, Danfoss RAS-C2 near New Forest£102
Fit thermostatic radiator valves, Danfoss RAS-C2 near Newbury£132
Fit thermostatic radiator valves, Danfoss RAS-C2 near Newcastle-under-Lyme£90
Fit thermostatic radiator valves, Danfoss RAS-C2 near Newcastle-upon-Tyne£98
Fit thermostatic radiator valves, Danfoss RAS-C2 near Newport£86
Fit thermostatic radiator valves, Danfoss RAS-C2 near North Ayrshire£92
Fit thermostatic radiator valves, Danfoss RAS-C2 near North East Lincolnshire£86
Fit thermostatic radiator valves, Danfoss RAS-C2 near North Hertfordshire£118
Fit thermostatic radiator valves, Danfoss RAS-C2 near North Lanarkshire£98
Fit thermostatic radiator valves, Danfoss RAS-C2 near North Lincolnshire£86
Fit thermostatic radiator valves, Danfoss RAS-C2 near North Somerset£92
Fit thermostatic radiator valves, Danfoss RAS-C2 near North Tyneside£98
Fit thermostatic radiator valves, Danfoss RAS-C2 near North Wiltshire£110
Fit thermostatic radiator valves, Danfoss RAS-C2 near Northampton£106
Fit thermostatic radiator valves, Danfoss RAS-C2 near Norwich£102
Fit thermostatic radiator valves, Danfoss RAS-C2 near Nottingham£92
Fit thermostatic radiator valves, Danfoss RAS-C2 near Nuneaton & Bedworth£94
Fit thermostatic radiator valves, Danfoss RAS-C2 near Oldham£92
Fit thermostatic radiator valves, Danfoss RAS-C2 near Oxford£110
Fit thermostatic radiator valves, Danfoss RAS-C2 near Pembrokeshire£68
Fit thermostatic radiator valves, Danfoss RAS-C2 near Perth & Kinross£90
Fit thermostatic radiator valves, Danfoss RAS-C2 near Peterborough£98
Fit thermostatic radiator valves, Danfoss RAS-C2 near Plymouth£82
Fit thermostatic radiator valves, Danfoss RAS-C2 near Poole£102
Fit thermostatic radiator valves, Danfoss RAS-C2 near Portsmouth£100
Fit thermostatic radiator valves, Danfoss RAS-C2 near Powys£102
Fit thermostatic radiator valves, Danfoss RAS-C2 near Preston£88
Fit thermostatic radiator valves, Danfoss RAS-C2 near Reading£132
Fit thermostatic radiator valves, Danfoss RAS-C2 near Redcar & Cleveland£96
Fit thermostatic radiator valves, Danfoss RAS-C2 near Reigate & Banstead£132
Fit thermostatic radiator valves, Danfoss RAS-C2 near Renfrewshire£96
Fit thermostatic radiator valves, Danfoss RAS-C2 near Rhondda, Cynon, Taff£88
Fit thermostatic radiator valves, Danfoss RAS-C2 near Rochdale£92
Fit thermostatic radiator valves, Danfoss RAS-C2 near Rochester-upon-Medway£104
Fit thermostatic radiator valves, Danfoss RAS-C2 near Rotherham£90
Fit thermostatic radiator valves, Danfoss RAS-C2 near Salford£94
Fit thermostatic radiator valves, Danfoss RAS-C2 near Salisbury£104
Fit thermostatic radiator valves, Danfoss RAS-C2 near Sandwell£96
Fit thermostatic radiator valves, Danfoss RAS-C2 near Scarborough£88
Fit thermostatic radiator valves, Danfoss RAS-C2 near Scottish Borders£106
Fit thermostatic radiator valves, Danfoss RAS-C2 near Sefton£92
Fit thermostatic radiator valves, Danfoss RAS-C2 near Sevenoaks£120
Fit thermostatic radiator valves, Danfoss RAS-C2 near Sheffield£90
Fit thermostatic radiator valves, Danfoss RAS-C2 near Slough£124
Fit thermostatic radiator valves, Danfoss RAS-C2 near Solihull£94
Fit thermostatic radiator valves, Danfoss RAS-C2 near South Ayrshire£92
Fit thermostatic radiator valves, Danfoss RAS-C2 near South Bedfordshire£110
Fit thermostatic radiator valves, Danfoss RAS-C2 near South Cambridgeshire£106
Fit thermostatic radiator valves, Danfoss RAS-C2 near South Gloucestershire£94
Fit thermostatic radiator valves, Danfoss RAS-C2 near South Kesteven£96
Fit thermostatic radiator valves, Danfoss RAS-C2 near South Lanarkshire£94
Fit thermostatic radiator valves, Danfoss RAS-C2 near South Oxfordshire£120
Fit thermostatic radiator valves, Danfoss RAS-C2 near South Somerset£80
Fit thermostatic radiator valves, Danfoss RAS-C2 near South Tyneside£98
Fit thermostatic radiator valves, Danfoss RAS-C2 near Southampton£104
Fit thermostatic radiator valves, Danfoss RAS-C2 near Southend-on-Sea£104
Fit thermostatic radiator valves, Danfoss RAS-C2 near St Albans£122
Fit thermostatic radiator valves, Danfoss RAS-C2 near St Helens£94
Fit thermostatic radiator valves, Danfoss RAS-C2 near Stafford£94
Fit thermostatic radiator valves, Danfoss RAS-C2 near Stockport£94
Fit thermostatic radiator valves, Danfoss RAS-C2 near Stockton-on-Tees£96
Fit thermostatic radiator valves, Danfoss RAS-C2 near Stoke-on-Trent£90
Fit thermostatic radiator valves, Danfoss RAS-C2 near Stratford-on-Avon£100
Fit thermostatic radiator valves, Danfoss RAS-C2 near Stroud£98
Fit thermostatic radiator valves, Danfoss RAS-C2 near Suffolk Coastal£152
Fit thermostatic radiator valves, Danfoss RAS-C2 near Sunderland£98
Fit thermostatic radiator valves, Danfoss RAS-C2 near Swale£104
Fit thermostatic radiator valves, Danfoss RAS-C2 near Swansea£86
Fit thermostatic radiator valves, Danfoss RAS-C2 near Tameside£94
Fit thermostatic radiator valves, Danfoss RAS-C2 near Teignbridge£90
Fit thermostatic radiator valves, Danfoss RAS-C2 near Tendring£128
Fit thermostatic radiator valves, Danfoss RAS-C2 near Test Valley£100
Fit thermostatic radiator valves, Danfoss RAS-C2 near Thamesdown£112
Fit thermostatic radiator valves, Danfoss RAS-C2 near Thanet£102
Fit thermostatic radiator valves, Danfoss RAS-C2 near The Wrekin£96
Fit thermostatic radiator valves, Danfoss RAS-C2 near Thurrock£110
Fit thermostatic radiator valves, Danfoss RAS-C2 near Torbay£90
Fit thermostatic radiator valves, Danfoss RAS-C2 near Trafford£96
Fit thermostatic radiator valves, Danfoss RAS-C2 near Vale of Glamorgan£90
Fit thermostatic radiator valves, Danfoss RAS-C2 near Vale of White Horse£106
Fit thermostatic radiator valves, Danfoss RAS-C2 near Vale Royal£86
Fit thermostatic radiator valves, Danfoss RAS-C2 near Wakefield£90
Fit thermostatic radiator valves, Danfoss RAS-C2 near Walsall£94
Fit thermostatic radiator valves, Danfoss RAS-C2 near Warrington£96
Fit thermostatic radiator valves, Danfoss RAS-C2 near Warwick£96
Fit thermostatic radiator valves, Danfoss RAS-C2 near Waveney£98
Fit thermostatic radiator valves, Danfoss RAS-C2 near Waverley£124
Fit thermostatic radiator valves, Danfoss RAS-C2 near Wealden£110
Fit thermostatic radiator valves, Danfoss RAS-C2 near West Lancashire£92
Fit thermostatic radiator valves, Danfoss RAS-C2 near West Lothian£104
Fit thermostatic radiator valves, Danfoss RAS-C2 near West Wiltshire£110
Fit thermostatic radiator valves, Danfoss RAS-C2 near Wigan£94
Fit thermostatic radiator valves, Danfoss RAS-C2 near Windsor & Maidenhead£124
Fit thermostatic radiator valves, Danfoss RAS-C2 near Wirral£90
Fit thermostatic radiator valves, Danfoss RAS-C2 near Wokingham£130
Fit thermostatic radiator valves, Danfoss RAS-C2 near Wolverhampton£96
Fit thermostatic radiator valves, Danfoss RAS-C2 near Wrexham Maelor£98
Fit thermostatic radiator valves, Danfoss RAS-C2 near Wychavon£100
Fit thermostatic radiator valves, Danfoss RAS-C2 near Wycombe£126
Fit thermostatic radiator valves, Danfoss RAS-C2 near York£84