Because the refrigerant pipes are joined and charged on site, and split systems usually use a fluorinated refrigerant such as R32, the refrigerant work must by law be done by an F-gas certified engineer. That makes installation a little more involved than a monobloc, and any later repair to the refrigerant circuit also needs F-gas certified work. In return, a split system copes better with long or awkward routes between the outdoor unit and the house, within the limits the manufacturer sets.
Owners across County Durham can compare split and monobloc designs side by side at a survey in County Durham. Flats and terraces in County Durham with a small yard or flat roof can suit a compact split outdoor unit. In County Durham homes where the clearest unit position is away from the plant cupboard, a split system allows a longer route indoors.
Who it suits
- Owners who would rather not use glycol or anti-freeze valves
- Exposed or frost-prone sites where outdoor water pipes would be a risk
- Small yards, roofs or balconies that suit a more compact outdoor unit
- Houses with indoor wall space for a boiler-sized hydrobox
Grants and rules for heat pumps in England
In England the Boiler Upgrade Scheme gives £7,500 towards an air source heat pump (£9,000 if it replaces oil or LPG, from 21 July 2026 to 31 March 2027), and since 28 April 2026 a valid EPC is no longer needed. The grant is applied for by the MCS-certified installer and shown as a deduction on your quote.
There is no VAT on installing a heat pump anywhere in the UK until 31 March 2027. In England most houses can have an air source heat pump under permitted development, provided the unit meets the MCS noise and siting standards; the old 1 m boundary limit was removed on 29 May 2025. We flag listed buildings, flats and sensitive conservation-area positions at survey.
Split system heat pumps prices in County Durham
The ranges below are typical installed prices for homes in County Durham, including VAT. A survey sets the exact figure, because two similar-looking houses in County Durham can need quite different radiators and pipework.
| Home | Typical size | Installed guide price | After £7,500 grant |
|---|---|---|---|
| 1–2 bedroom flat or small terrace | 4–5 kW | £9,200–£12,150 | £1,700–£4,650 |
| 2–3 bedroom terrace or semi | 5–7 kW | £10,200–£13,100 | £2,700–£5,600 |
| 3 bedroom semi or small detached | 6–9 kW | £11,650–£15,050 | £4,150–£7,550 |
| 4 bedroom detached | 8–12 kW | £13,600–£17,450 | £6,100–£9,950 |
| 5+ bedroom or larger older house | 11–16 kW | £16,000–£21,850 | £8,500–£14,350 |
Installed, inc VAT: unit, cylinder, controls, minor pipework and commissioning.
Towns we cover in County Durham
We cover 14 towns in County Durham for split system heat pumps. Each links to local guide prices and the grant position for England.
| Town | Postcode district | Nearest town | Midwinter daylight |
|---|---|---|---|
| Darlington | DL1 | Newton Aycliffe | 7 h 16 min |
| Hartlepool | TS26 | Peterlee | 7 h 14 min |
| Stockton-on-Tees | TS18 | Billingham | 7 h 15 min |
| Durham | DH1 | Chester-le-Street | 7 h 13 min |
| Chester-le-Street | DH2 | Stanley | 7 h 12 min |
| Billingham | TS23 | Stockton-on-Tees | 7 h 15 min |
| Stanley | DH9 | Chester-le-Street | 7 h 12 min |
| Consett | DH8 | Stanley | 7 h 12 min |
| Newton Aycliffe | DL5 | Bishop Auckland | 7 h 15 min |
| Bishop Auckland | DL14 | Newton Aycliffe | 7 h 14 min |
| Seaham | SR7 | Peterlee | 7 h 12 min |
| Peterlee | SR8 | Seaham | 7 h 13 min |
| Barnard Castle | DL12 | Bishop Auckland | 7 h 16 min |
| Sedgefield | TS21 | Newton Aycliffe | 7 h 14 min |
Split system heat pumps questions
Is a split system more efficient than a monobloc?
Not inherently. Efficiency depends far more on design, meaning correct sizing, low flow temperatures and good controls, than on whether the unit is split or monobloc. A split system can avoid the heat loss and glycol of a long outdoor water run, which helps in certain layouts. The survey estimates seasonal efficiency for the specific units proposed, so you can compare like for like.
How far apart can the outdoor unit and hydrobox be?
It depends on the model: each manufacturer sets a maximum refrigerant pipe length and height difference, and longer runs may need extra refrigerant. In practice a split system allows more flexibility than a monobloc's water pipes, so the outdoor unit can often sit on the far side of a house, on a flat roof or round a corner. The survey measures the actual route.
How big is a hydrobox?
A hydrobox is typically about the size of a wall-mounted boiler, though sizes vary by make and model. It needs wall space near the cylinder with room around it for servicing and pipe connections. Some manufacturers combine the hydrobox and cylinder in a single floor-standing unit similar in size to a tall fridge-freezer, which can suit a utility room or garage.
Do I need an F-gas engineer for a split heat pump?
Yes. Split systems usually use a fluorinated refrigerant such as R32, so installing, servicing or repairing the refrigerant circuit must by law be done by an F-gas certified engineer. That covers joining the refrigerant pipes, testing them for leaks and charging the system. Your quote sets out who carries out each part of the installation, including the refrigerant work.