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Install solar thermal.
Solar thermal hot water — flat-plate or evacuated tube collector. Different from solar PV. Pre-heats cylinder.
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Lower priority vs solar PV
Solar PV (electricity) more flexible, can power heat pump for hot water plus other uses. Most homes now choose PV.
Roof orientation requirement
South-facing roof essential. Less suitable for east-west or shaded.
Heat pump integration
If installing heat pump, water heating from heat pump efficient. Solar thermal redundant.
Glycol changes
Antifreeze degrades every 5–7 years. Replacement £200–£500.
Costs & timeline
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Indicative UK ranges and what affects price.
Cost range
By job type
Inc. VAT · 2026
Source: NMT quotes
Source: NMT quotes
Evacuated tube panels (2 m²)30 tubes typical
£1.5k–£3.5k
Flat plate panels (4 m²)UK common option
£1.5k–£3.5k
Twin-coil cylinder upgradeMegaflo or similar
£800–£2.2k
Install labour1–2 days
£800–£2k
Control system + pumpIncluded usually
£200–£500
Standard solar thermal installComplete
£3.5k–£6.5k
!
Quote spread is typically ± 18% — always get 3 quotes.
At a glance
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Solar thermal heats domestic hot water via evacuated tube or flat plate panels. Modern UK trend favours solar PV over thermal (electrical pairs with heat pumps). Expect to pay £3,500–£6,500 for UK solar thermal installation.
What Does the Work Involve?
MCS-certified installer surveys roof and existing hot water system. Solar panels (evacuated tubes typical UK) mounted on roof. Glycol antifreeze loop runs to twin-coil cylinder (replaces existing or new). Pump and control system. Connects to existing boiler for backup. MCS notification for SEG eligibility (though solar thermal eligibility limited).
Typical Costs
| Item | Low (£) | High (£) | Notes |
|---|---|---|---|
| Evacuated tube panels (2 m²) | 1,500 | 3,500 | 30 tubes typical |
| Flat plate panels (4 m²) | 1,500 | 3,500 | UK common option |
| Twin-coil cylinder upgrade | 800 | 2,200 | Megaflo or similar |
| Install labour | 800 | 2,000 | 1–2 days |
| Control system + pump | 200 | 500 | Included usually |
| Standard solar thermal install | 3,500 | 6,500 | Complete |
| Annual hot water savings | £150 | £400 | Depending on gas tariff |
How Long Does It Take?
Standard install: 1–2 days. Plus survey and cylinder ordering.
DIY or Professional?
MCS-certified installer. Specialist solar thermal company or experienced heating engineer.
Choosing the Right Tradesperson
MCS-certified for solar thermal. Brands: Viessmann, Vaillant, Solarcent, Solar Force. UK manufacturers thinning since solar PV took over market.
UK Regulations
MCS for any grant eligibility. Building Regs Part L. Permitted development for typical install. Listed buildings need consent.
Common Problems
- Lower priority vs solar PV: Solar PV (electricity) more flexible, can power heat pump for hot water plus other uses. Most homes now choose PV.
- Roof orientation requirement: South-facing roof essential. Less suitable for east-west or shaded.
- Heat pump integration: If installing heat pump, water heating from heat pump efficient. Solar thermal redundant.
- Glycol changes: Antifreeze degrades every 5–7 years. Replacement £200–£500.
Frequently Asked Questions
Solar thermal vs solar PV?
Solar PV is the modern UK choice — generates electricity for all uses (incl. immersion heating for hot water). Solar thermal limited to hot water only. PV preferred.
Will I save much?
Hot water savings: £150–£400/year. Payback 10–20 years. Slower than solar PV payback.
Best panel type?
Evacuated tubes: highest efficiency, premium price. Flat plate: cheaper, slightly less efficient. UK typical install: evacuated tubes 2 m².
How long do panels last?
25+ years for panels. Cylinder coil 25+ years. Pump 10–15 years. Antifreeze refresh 5–7 years.
Suitable for off-grid?
Yes — solar thermal can heat water without grid electricity. Combined with wood-burning boiler or LPG for backup. Off-grid winter limited though.
BUS grant for solar thermal?
Limited. BUS grant focused on heat pumps. Solar thermal usually self-funded. Some local council schemes may apply.
This guide was written with AI assistance and is intended for general information only. Prices are estimates based on UK averages and may vary by region. Always get at least three quotes and consult a qualified professional before starting any work.
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