Updated 25 September 2026
Unvented cylinder cost UK 2026
The going rate for unvented cylinder in 2026 is £1,500–£3,500 (total, ex VAT). Below: a calculator, what the job involves, materials at three price levels, and the prep that changes the price.
Market band£1,500–£3,500
Worked example, 1 cylinder£2,260
Time on site1 days
Unvented cylinder calculator
Price a real job freeUses your rates, your speed and your receipts.
Market band source: Trade2Base.
What the job involves
| Stage | Task | Typical time |
|---|---|---|
| out | Remove cylinder and loft tanks, cap off | 4 h |
| in | Fit unvented cylinder | 6 h |
| in | Tundish and D2 discharge pipework | 3 h |
| in | Commission and benchmark | 1 h |
Materials at three price levels
| Material | Budget | Trade choice | Premium |
|---|---|---|---|
| Unvented cylinder each | £700 Entry unvented cylinder — Mains-pressure hot water | £1,000 Branded stainless unvented — Long warranty | £1,600 Heat-pump-ready cylinder — Future-proof |
| PRV, expansion vessel, tundish, D2 pipe set | £150 Supplied inlet group only — Minimum safety kit | £250 Inlet group plus D2 run — Compliant discharge | £400 Plus larger vessel and trace heating — Frost-proof discharge |
| Valves, pipe, fittings and condensate allowance | £50 Standard fittings — Connects up | £80 Fittings plus frost-protected condensate — No frozen condensate | £120 Full copper tails and lagging — Tidy, efficient |
Trade prices ex VAT, estimates checked 2026-09-25. Log your receipts in Grafto and your own prices replace these.
What changes the price
- Mains flow and pressure? good (tested) · poor · not tested big effect
- Cylinder size? 150 L · 210 L · 250 L+
Prep to look for
| Condition | Check | Effect |
|---|---|---|
| Possible asbestos lagging | old grey or white pipe lagging | Possible asbestos lagging: stop and test before disturbing |
| Corroded fittings | green or white crust, rust on valves and pipes | Replace corroded valves |
| Lead pipe | dull grey soft pipe, wiped joints | Lead supply pipe: recommend replacement |
Questions
How much does unvented cylinder cost in the UK in 2026?
The researched market band is £1,500–£3,500 (total, ex VAT), from Trade2Base. A worked example of 1 cylinder comes to about £1,691–£3,307 across budget, trade and premium materials.
How long does unvented cylinder take?
The worked example of 1 cylinder takes about 1 working days.
What changes the price of unvented cylinder?
Mainly mains flow and pressure, plus any prep found on site: possible asbestos lagging, corroded fittings, lead pipe.