MCS Aligned · BUS Grant £7,500 ready · F-Gas aware
Heat Pump Electrical in Fraserburgh, AB43
Electrical scope for Mitsubishi Ecodan, Daikin Altherma, Vaillant aroTHERM, Worcester Bosch, and Samsung EHS air source heat pumps. Single phase or three phase, hydrobox wiring, smart controls, BUS grant paperwork supported.
Pairing with solar PV? See solar + heat pump combination.
UK government Boiler Upgrade Scheme
£7,500 off your heat pump install
Raised from £5,000 to £7,500 in October 2023. Goes direct to the installer, you never pay then claim back. We work with MCS-certified heating engineers to deliver eligible installs across Fraserburgh and AB43.
- ✓You own the property (homeowner or landlord)
- ✓Valid EPC with no outstanding insulation requirements
- ✓Replacing fossil fuel system (gas, oil, LPG)
- ✓MCS certified installer (we partner with eligible MCS engineers)
What we do (and don't)
The electrical scope for a heat pump install
A heat pump install is a two trade job. The MCS-certified heating engineer handles refrigerant pipe work, the indoor hydrobox plumbing, radiator system modifications, and the MCS commissioning paperwork that unlocks the £7,500 BUS grant. We handle the electrical scope: power supply, hydrobox wiring, smart controls, consumer unit work, and any DNO upgrades.
We work two ways. About 60% of our heat pump electrical work is sub-contracted by an MCS heating company that's chosen us as their local Fraserburgh sparky. The other 40% is direct to homeowners who've chosen the heat pump independently and need the electrical work coordinated separately. Either way, we coordinate with the heating engineer so the install passes MCS commissioning first time.
What we don't do: refrigerant pipe work (F-Gas regulated, requires a different qualification), MCS heat pump commissioning (heating engineer's role), or heat loss surveys (heating engineer's role). For end-to-end install we partner with MCS engineers we trust, you can hire either of us to lead.
Our 6 electrical elements
What we wire on every heat pump install
- 1
Outdoor unit power supply
Dedicated circuit from the consumer unit to the outdoor unit. Single phase 32A or 40A typical for domestic, three phase 16A on larger units. Cable size matched to load (typically 6mm or 10mm twin-and-earth, sometimes 4mm SWA buried). RCD or RCBO protection mandatory.
- 2
Indoor unit / hydrobox wiring
Hydrobox houses the heat exchanger, circulation pump, and controls. Needs its own 13A spur or 16A circuit depending on model. Must be on the same RCD as the outdoor unit so a single trip isolates the whole system.
- 3
Pre-buffer tank pump and zone valves
Most ASHPs need a buffer tank between the heat pump and the radiator circuits. Pump and zone valves on the buffer tank connect back to the hydrobox via low voltage control wiring. We work alongside the heating engineer to wire the controls correctly.
- 4
Smart controls and weather compensation
Modern ASHPs use weather compensation: outdoor temperature sensor adjusts flow temperature automatically. Plus smart thermostats (Tado, Hive, Nest) integrate with most heat pumps. We do the wiring and the integration setup.
- 5
Three phase upgrade (where supply allows)
Larger ASHPs (12kW+) often need three phase supply. UK domestic is normally single phase 100A. SSEN can sometimes upgrade to three phase, but the cost ranges from a few hundred pounds to several thousand depending on cable runs. We coordinate the SSEN G99 application.
- 6
Earthing review and consumer unit upgrade
Old consumer units often don't have a spare way for the new heat pump circuit, or the existing earthing arrangement (TT, TN-S, PME) needs review. About 50% of Fraserburgh heat pump installs trigger a consumer unit upgrade as part of the work.
The efficiency numbers
COP, SCOP, and what they actually mean
Heat pumps don't generate heat, they move heat. The efficiency rating tells you how much heat output you get per unit of electricity input. Two numbers matter, COP and SCOP.
COP
Coefficient of Performance
Instantaneous efficiency at one specific outdoor temperature. COP varies through the day. At 7°C outdoor, modern ASHP COP is 4.0+. At -5°C it drops to 2.0-2.5.
SCOP
Seasonal COP (the meaningful one)
Average COP across a typical UK heating season. The number that should drive your buying decision. Best modern ASHPs hit SCOP 4.5+ (Mitsubishi Ecodan, Daikin Altherma).
For a Fraserburgh property, expect winter COP to drop on the coldest mornings. The harbour latitude (57.7°N) means seasonal SCOP runs 5 to 10% lower than south UK averages, but the system is still net-positive against any fossil fuel boiler. Pair the heat pump with solar PV (see our solar electrical service) and the running cost falls further.
The 5 mainstream UK brands
Mitsubishi vs Daikin vs Vaillant vs Worcester vs Samsung
Honest brand comparison. We install electrical scope for all 5. The MCS heating engineer typically picks the brand based on heat loss survey, then we do our part.
- £3,200 electrical scope
Mitsubishi Ecodan
Made in Scotland (Livingston)
Best for: Premium UK install, made in Scotland, longest warranty
- Refrigerant
- R32
- SCOP
- 4.45
- BUS grant
- ✓ Eligible
- ✓Made 30 miles from Fraserburgh (Livingston)
- ✓Best UK installer network
- ✓5 year warranty standard
- £2,800 electrical scope
Daikin Altherma 3
Made in Belgium / Czech Republic
Best for: Highest published SCOP, slightly more affordable than Mitsubishi
- Refrigerant
- R32
- SCOP
- 4.60
- BUS grant
- ✓ Eligible
- ✓Highest A+++ rated efficiency
- ✓Wide installer network
- ✓Strong warranty
- £3,000 electrical scope
Vaillant aroTHERM Plus
Made in UK (Belper, Derbyshire)
Best for: Future-proof refrigerant (R290), UK manufactured, low global warming potential
- Refrigerant
- R290 (propane, lowest GWP)
- SCOP
- 4.00
- BUS grant
- ✓ Eligible
- ✓R290 refrigerant (3 GWP vs R32 at 675)
- ✓UK made, strong UK service
- ✓Compatible with Vaillant boiler controls
- £2,900 electrical scope
Worcester Bosch Greensource
Made in UK (Worcester)
Best for: UK heritage brand, strong service network, hybrid options available
- Refrigerant
- R32
- SCOP
- 4.00
- BUS grant
- ✓ Eligible
- ✓Most familiar UK brand
- ✓Excellent local engineer support
- ✓Hybrid boiler+ASHP options
- £2,600 electrical scope
Samsung EHS
Made in South Korea
Best for: Budget-conscious choice, decent SCOP, smart app integration
- Refrigerant
- R32
- SCOP
- 4.50
- BUS grant
- ✓ Eligible
- ✓Most affordable mainstream option
- ✓Best smart app
- ✓Compact outdoor unit
The R32 vs R290 question
F-Gas regulations and what refrigerant to specify
UK F-Gas regulations are tightening. The 2024 amendments accelerated the phase-down of high global warming potential (GWP) refrigerants. R410A (used in older heat pumps, GWP 2,088) is now phased out for new domestic installs.
Two refrigerants dominate new installs. R32: GWP 675, used by Mitsubishi, Daikin, Worcester Bosch, Samsung. Mainstream and proven. R290 (propane): GWP 3, used by the latest Vaillant aroTHERM Plus. Mildly flammable so installation rules are stricter (minimum distance from doors, windows, drains), but future-proof against further F-Gas amendments.
For Fraserburgh installs we don't push either. The MCS heating engineer specifies based on the property layout. Our electrical scope is the same for both.
The honest Aberdeenshire angle
Heat pumps in Fraserburgh granite cottages, what to expect honestly
Fraserburgh sits at 57.7° North. Coldest winter mornings reach -5 to -2°C, far less extreme than Highland Scotland but cooler than south UK. Modern ASHPs maintain useful COP down to -15°C, so absolute cold isn't the problem. The harder issue is heat loss in older granite cottage stock: thicker walls store cold, draughts dominate, and old radiator systems are sized for boiler flow temperatures (70-80°C) not heat pump temperatures (35-50°C).
For a granite cottage to work well with a heat pump you typically need: cavity insulation if achievable (most pre-1900 granite cottages don't have cavity walls, just solid stone), loft insulation upgraded to 270mm minimum, draught proofing on every external door and window, and either larger radiators (output ratings recalculated for 50°C flow) or underfloor heating in the main rooms.
Without those upgrades, the heat pump will work but struggle on the coldest days, and your bills won't beat the oil or LPG boiler you replaced. We're honest about this in the survey. Hybrid systems (heat pump + retained boiler for cold snaps) are often the right answer for older Aberdeenshire stock.
Electrical scope pricing
Heat pump electrical cost in Fraserburgh
Electrical scope only (excludes the heat pump itself, refrigerant work, and MCS commissioning, which are the heating engineer's domain). Bundled with the heating engineer's quote where we work end-to-end.
| Electrical scope | Price |
|---|---|
| Single phase ASHP electrical (typical 8 to 11kW unit) | from £2,600 |
| Mitsubishi Ecodan electrical scope | from £3,200 |
| Daikin Altherma 3 electrical scope | from £2,800 |
| Vaillant aroTHERM Plus (R290) electrical scope | from £3,000 |
| Worcester Bosch / Samsung electrical scope | from £2,600 |
| Three phase upgrade where required (excl SSEN fees) | from £1,200 |
| Consumer unit upgrade alongside (typical) | from £550 |
| Smart thermostat integration (Tado, Hive, Nest) | from £140 |
| Solar PV + heat pump combined electrical | Bundle discount |
BUS grant note: the £7,500 grant applies to the total install (heat pump + electrical + heating system modifications) when delivered through an MCS-certified installer. We work with MCS heating engineers to deliver eligible installs.
Common questions
Heat Pump Electrical FAQs for Fraserburgh
What's the £7,500 Boiler Upgrade Scheme grant exactly?
The Boiler Upgrade Scheme (BUS) is the UK government's grant for replacing fossil fuel heating with low-carbon alternatives. £7,500 off the cost of an air source heat pump (raised from £5,000 in October 2023). Eligibility: you own the property (not a tenant), it's your main residence or rental property, you have a valid EPC with no outstanding loft / cavity insulation recommendations, and you're using an MCS-certified installer. We work with MCS-aligned heating engineers to deliver eligible installs. Grant goes direct to the installer so you never pay it then claim back.
What's the difference between COP and SCOP?
COP (Coefficient of Performance) is the heat output divided by electricity input at one specific outdoor temperature. SCOP (Seasonal COP) is the same calculation averaged across a typical UK heating season. SCOP is the meaningful number because it reflects real-world operation. Modern ASHPs published SCOP runs 4.0 to 4.6 (meaning 4 to 4.6 kWh of heat per 1 kWh of electricity). At -5°C in Fraserburgh winter the live COP drops to 2.0 to 2.5, but the system is still net positive vs an oil or LPG boiler.
Which refrigerant should I pick: R32 or R290?
R32 is the dominant refrigerant in modern ASHPs (Mitsubishi, Daikin, Worcester, Samsung all use it). Global warming potential 675, far better than older R410A (2,088). R290 (propane) is the newest option used by Vaillant aroTHERM Plus. GWP of 3, basically negligible. R290 is mildly flammable so installation rules are stricter (minimum distance from openings), and the system is slightly more expensive. R290 is future-proof against refrigerant phase-down regulations, R32 is the safer mainstream choice.
Do I need three phase electricity for a heat pump in Fraserburgh?
Most domestic ASHPs (5kW to 11kW range) run on single phase 100A which is what most Fraserburgh homes have. Larger systems (12kW to 16kW for big detached or poorly insulated granite cottages) sometimes need three phase. SSEN can upgrade your supply to three phase but the cost ranges from a few hundred pounds (if the three phase cable is in the street already) to several thousand (if new street works are needed). For 95% of Fraserburgh domestic installs, single phase is fine.
How well do heat pumps work in Fraserburgh winter cold?
Better than people assume. Modern ASHPs maintain useful COP down to -15°C (Fraserburgh's coldest is rarely below -5°C). The published SCOP 4.0 to 4.6 figures average across the season, the COP at peak cold is 2.0 to 2.5 which is still net-efficient vs gas (gas boilers are typically 90% efficient = 0.9 COP equivalent). Sandhaven and harbour-front properties get slightly less efficiency due to coastal humidity affecting the outdoor coil, but the difference is single digit percent.
What's the difference between this electrical work and the heat pump install itself?
Two trades. The heating engineer (MCS-certified) installs the heat pump, runs the refrigerant lines, connects the hydrobox to the radiator system, balances the heating system, and commissions for MCS sign-off. We do the electrical side: power supply to the outdoor unit, wiring the hydrobox, smart controls, consumer unit work. About 60% of our heat pump electrical work is sub-contracted by an MCS heating company. The other 40% is direct to homeowners who've chosen the heat pump and need the electrical sub.
Can I keep my existing oil or LPG boiler as a backup?
Yes, this is a hybrid setup and increasingly popular in older Aberdeenshire stone homes. Heat pump handles the bulk of the heating, oil/LPG kicks in during the coldest snaps when ASHP COP drops below 2.0 (typically below -5°C outdoor temperature). Vaillant and Worcester Bosch both have integrated hybrid controllers. Hybrid systems are still BUS grant eligible if the heat pump replaces the primary heating, with the existing boiler kept as supplementary.
Is there a future for heat pumps in Fraserburgh granite cottages?
Yes, but with realistic expectations. Granite cottages have higher heat loss than modern builds (thicker walls, more thermal mass to heat, often draughty). To make ASHP work in a cottage you typically need: cavity insulation if achievable, loft insulation to current building regs, draught proofing, and either larger radiators or underfloor heating to deliver the required heat at lower flow temperatures (heat pumps work best at 35-50°C flow, vs a boiler's 70-80°C). Without insulation upgrades, ASHP can struggle to keep a granite cottage warm.
Heat pump electrical scope in Fraserburgh? Free quote in 24 hours.
MCS aligned, BUS £7,500 grant ready. Mitsubishi, Daikin, Vaillant, Worcester Bosch, Samsung. We work direct or as electrical sub for an MCS heating company.