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Heat Pump Advice & Guides

Expert heat pump advice from qualified UK engineers. Guides on servicing, repairs, installation costs, efficiency tips, and choosing the right system.

How Heat Pumps Work

How the technology works, what affects efficiency, and whether a heat pump suits your home.

Heat Pumps in New Build Homes guide tile: newly built brick houses with tiled roofs on a housing developmentHeat Pumps in New Build Homes: What to ExpectHeat Pumps for Second Homes guide tile: row of thatched stone cottages on a village streetHeat Pumps for Second Homes & Holiday CottagesHeat Pump Noise Levels guide tile: outdoor heat pump unit set between two potted trees against a terracotta wallHeat Pump Noise Levels: dB(A) ExplainedHeat Pump Smart Controls guide tile: a modern heating control panel with a dial, on a wooden surfaceHeat Pump Smart Controls: Maximising Efficiency with TechnologyHeat Pump Hot Water Cylinders guide tile: copper pipework and valves connecting a heating system in a plant roomHeat Pump Hot Water Cylinders: Everything You Need to KnowHeat Pump vs Gas Boiler guide tile: dark air source heat pump outdoor unit on a plinth beside a houseHeat Pump vs Gas Boiler: The Complete UK Comparison 2026Heat Pumps and Radiators guide tile: white panel radiator beneath a window in a living roomHeat Pump & Radiator Compatibility: Do You Need to Upgrade?10 Tips to Improve Heat Pump Efficiency guide tile: loft with insulation laid between the rafters10 Tips to Improve Your Heat Pump EfficiencyHeat Pump CoP Explained guide tile: two large air source heat pump units on a lawn beside a houseHeat Pump CoP Explained: Understanding Efficiency RatingsUnderfloor Heating with a Heat Pump guide tile: underfloor heating pipe loops laid on insulation before the screed is pouredUnderfloor Heating with a Heat Pump: The Perfect CombinationAir Source vs Ground Source guide tile: lawn in front of a row of modern houses, the kind of open ground a ground source loop needsAir Source vs Ground Source Heat Pump: Which Is Better for UK Homes?Do Heat Pumps Work in Cold Weather? guide tile: snow-covered outdoor equipment beside bare winter treesDo Heat Pumps Work in Cold Weather? UK Winter PerformanceHow Do Heat Pumps Work? guide tile: white air source heat pump outdoor unit on gravel beside a house wallHow Do Heat Pumps Work? A Complete UK Guide

Costs & Grants

Servicing, repair, installation and running costs, plus every grant and finance route available in the UK.

Heat Pump Electricity Bills guide tile: hands holding a programmable heating thermostatHeat Pump Electricity Bills: How to Estimate & Reduce CostsHeat Pump Running Costs guide tile: street of red-brick terraced houses on a cloudy dayHeat Pump Running Costs UK 2026: How Much Will You Pay?Is Heat Pump Cover Worth It? guide tile: grey air source heat pump outdoor unit outside a stone-clad houseIs Heat Pump Cover Worth It? Annual Plans ReviewedHeat Pump Insurance guide tile: brick terraced cottage with a white door and window boxesHeat Pump Insurance: What’s Covered & What You NeedHeat Pump Grants UK guide tile: victorian terraced street with bay windows and parked carsHeat Pump Grants UK 2026: All Available FundingHeat Pump Grants Scotland guide tile: whitewashed cottages on a narrow street with hills behindHeat Pump Grants Scotland 2026: Full Funding GuideHeat Pump Servicing Cost guide tile: black air source heat pump outdoor unit beside a hedgeHeat Pump Servicing Cost UK 2026: What to ExpectHeat Pump Installation Cost guide tile: new-build brick houses on a recently completed estate roadHeat Pump Installation Cost UK 2026: Full Price GuideHeat Pump Finance Options guide tile: brick semi-detached house with a slate roof and front gardenHeat Pump Finance Options UK: How to Fund Your InstallationBoiler Upgrade Scheme guide tile: detached Georgian red-brick house with white sash windowsBoiler Upgrade Scheme 2025: Everything UK Homeowners Need to Know

Faults & Repairs

Diagnosing common heat pump faults, error codes and breakdowns, and what a repair should cost.

Vaillant low water pressure guide tile: a Vaillant uniTOWER indoor unit in a bright utility room beside a washing machine and tumble dryerVaillant Heat Pump F.22 & F.73 Error: Low Water Pressure Meaning, Causes & FixesMitsubishi Ecodan low water pressure guide tile: a Mitsubishi Ecodan pre-plumbed cylinder installed indoorsMitsubishi Ecodan Heat Pump Low Pressure: Causes, Checks & FixesOctopus Cosy low water pressure guide tile: an installer's gloved hands wiring a wall-mounted Octopus Cosy hub with a screwdriverOctopus Cosy Heat Pump Low Pressure: Causes, Checks & FixesGrant Aerona low water pressure guide tile: a Grant pre-plumbed cylinder in a fitted utility room beside a washing machineGrant Aerona Heat Pump Low Pressure: Causes, Checks & FixesHitachi Yutaki low water pressure guide tile: a Hitachi Yutaki floor-standing indoor unit with built-in cylinder and controller in a utility roomHitachi Yutaki Heat Pump Alarm 70 Error: Low Water Pressure Meaning, Causes & FixesHaier low water pressure guide tile: a cutaway illustration of a house showing the Haier indoor unit and cylinder in a utility areaHaier Heat Pump Low Pressure: Causes, Checks & FixesIdeal Heat Pump 370 low water pressure guide tile: a close-up of an Ideal indoor unit on a new-build installationIdeal Heat Pump 370 F27 & AE Error: Low Water Pressure Meaning, Causes & FixesNibe low water pressure guide tile: a NIBE indoor unit with integrated cylinder in a tiled basement plant roomNibe Heat Pump Low Pressure: Causes, Checks & FixesPanasonic Aquarea low water pressure guide tile: a Panasonic Aquarea indoor hydraulic unit and cylinder in a utility roomPanasonic Aquarea Heat Pump H62 & H21 Error: Low Water Pressure Meaning, Causes & FixesViessmann Vitocal low water pressure guide tile: a Viessmann Vitocal floor-standing indoor unit with integral cylinder beside the outdoor unitViessmann Vitocal Heat Pump F.74 & F.75 Error: Low Water Pressure Meaning, Causes & FixesCTC low water pressure guide tile: the CTC indoor module range with cylinders, shown as product imagesCTC Heat Pump Low Pressure: Causes, Checks & FixesDaikin Altherma low water pressure guide tile: a green utility room with a Daikin Altherma floor-standing indoor unit beside a stacked washer and dryerDaikin Altherma Heat Pump 7H-01 & 7H-05 Error: Low Water Pressure Meaning, Causes & FixesSamsung EHS low water pressure guide tile: a Samsung ClimateHub indoor unit in an open cupboard with the outdoor unit on the balcony outsideSamsung EHS Heat Pump E911 & E912 Error: Low Water Pressure Meaning, Causes & FixesWorcester Bosch low water pressure guide tile: a Worcester Bosch floor-standing indoor unit in a plant room with insulated pipework and an expansion vesselWorcester Bosch Heat Pump Low Pressure: Causes, Checks & FixesAira low water pressure guide tile: an Aira compact indoor unit in a fitted wooden utility cupboard beside a washing machineAira Heat Pump Low Pressure: Causes, Checks & FixesCTC freeze & defrost faults guide tile: a CTC outdoor unit against grey timber claddingCTC Heat Pump E135 Error: Freeze Protection Meaning, Causes & FixesAira freeze & defrost faults guide tile: an Aira outdoor unit against a rendered wall in deep snow with snow-capped plantersAira Heat Pump Frozen or Iced Up: Causes, Checks & FixesPanasonic Aquarea freeze & defrost faults guide tile: a Panasonic Aquarea outdoor unit on a lawn against a brick wall below a windowPanasonic Aquarea Heat Pump H99 & H42 Error: Freeze Protection Meaning, Causes & FixesMitsubishi Ecodan freeze & defrost faults guide tile: a Mitsubishi Ecodan outdoor unit on gravel beside a timber-clad houseMitsubishi Ecodan Heat Pump L6 & P6 Error: Freeze Protection Meaning, Causes & FixesIdeal Heat Pump freeze & defrost faults guide tile: an Ideal monobloc outdoor unit outside a stone-built new house on a wet winter dayIdeal Heat Pump Frozen Outdoor Unit: F15, F17 Codes, Causes & FixesHitachi freeze & defrost faults guide tile: a white Hitachi Yutaki outdoor unit on a gravel bed beside a modern white house with a timber terraceHitachi Heat Pump Frozen Outdoor Unit: Codes, Causes & FixesHaier freeze & defrost faults guide tile: a dark grey Haier outdoor unit on frozen snowy ground outside a kitchen windowHaier Heat Pump E15 Error: Anti-Freeze Fault Meaning, Causes & FixesGrant Aerona freeze & defrost faults guide tile: a white Grant Aerona outdoor unit against a Cotswold stone wall on a paved areaGrant Aerona Heat Pump C1, C3 & A7 Error: Frozen Outdoor Unit Meaning, Causes & FixesDaikin Altherma freeze & defrost faults guide tile: a Daikin Altherma outdoor unit beside the porch of a white house in snowDaikin Altherma Heat Pump 89-01, 89-02 & 89-03 Error: Frozen Heat Exchanger Meaning, Causes & FixesNibe freeze & defrost faults guide tile: a NIBE outdoor unit below blue-shuttered windows with a bare tree in frontNibe Heat Pump Alarm 228 & 83 Error: Defrost Fault Meaning, Causes & FixesOctopus Cosy freeze & defrost faults guide tile: an Octopus Cosy outdoor unit by a brick house with pink cyclamen in the foregroundOctopus Cosy Heat Pump Frozen or Iced Up: Causes, Checks & FixesSamsung freeze & defrost faults guide tile: a Samsung outdoor unit in a garden with falling snow and snow-dusted hedgesSamsung Heat Pump E908 & E909 Error: Freeze Protection Meaning, Causes & FixesVaillant freeze & defrost faults guide tile: a Vaillant outdoor unit outside a brick house in snowVaillant Heat Pump F.741 & F.283 Error: Defrost Fault Meaning, Causes & FixesViessmann Vitocal freeze & defrost faults guide tile: a Viessmann Vitocal outdoor unit on a floor console beside a modern brick houseViessmann Vitocal Heat Pump 21 Error: Frozen Unit & Low Evaporation Pressure Meaning, Causes & FixesWorcester Bosch freeze & defrost faults guide tile: a Worcester Bosch outdoor unit on a patio beside a brick house with shrubsWorcester Bosch Heat Pump Pb & Hb Error: Freeze Protection Meaning, Causes & FixesMitsubishi Ecodan error codes explained guide tile: a Mitsubishi Ecodan main controller mounted on a kitchen wallMitsubishi Electric Ecodan Heat Pump Error Codes: Meanings, Causes, Fixes & What to DoVaillant error codes explained guide tile: hands adjusting a wall-mounted Vaillant sensoCOMFORT control showing the room temperatureVaillant Heat Pump Error Codes: Meanings, Causes, Fixes & What to DoGrant Aerona error codes explained guide tile: a hand pressing buttons on the wall-mounted Grant Aerona remote controllerGrant Aerona Heat Pump Error Codes: Meanings, Causes, Fixes & What to DoHitachi Yutaki error codes explained guide tile: a hand holding a smartphone showing the Hitachi home control appHitachi Yutaki Heat Pump Error Codes: Meanings, Causes, Fixes & What to DoDaikin Altherma error codes explained guide tile: the Daikin Madoka wired room controller showing 21 degreesDaikin Altherma Heat Pump Error Codes: Meanings, Causes, Fixes & What to DoSamsung error codes explained guide tile: a hand operating the Samsung ClimateHub wired touch controllerSamsung Heat Pump Error Codes: Meanings, Causes, Fixes & What to DoOctopus Cosy error codes explained guide tile: the Octopus Cosy wall-mounted room thermostat with its boost buttonOctopus Energy Cosy Heat Pump Error Codes & Fault Lights: Meanings, Causes, Fixes & What to DoAira error codes explained guide tile: a hand holding a phone showing the Aira app in front of the outdoor unit grilleAira Heat Pump Error Codes & Fault Lights: Meanings, Causes, Fixes & What to DoViessmann Vitocal error codes explained guide tile: hands holding a smartphone showing the Viessmann ViCare app home screenViessmann Vitocal Heat Pump Error Codes: Meanings, Causes, Fixes & What to DoPanasonic Aquarea error codes explained guide tile: a hand holding a smartphone showing the Panasonic Aquarea Smart Cloud appPanasonic Aquarea Heat Pump Error Codes: Meanings, Causes, Fixes & What to DoNibe error codes explained guide tile: the NIBE myUplink app shown on two smartphonesNibe Heat Pump Error Codes: Meanings, Causes, Fixes & What to DoCTC error codes explained guide tile: the CTC EcoLogic wall controller with a colour touch displayCTC Heat Pump Error Codes: Meanings, Causes, Fixes & What to DoIdeal Heat Pump error codes explained guide tile: the Ideal Halo thermostat, hub, dial controller and app shown togetherIdeal Heat Pump Error Codes: Meanings, Causes, Fixes & What to DoHaier error codes explained guide tile: a hand holding a smartphone showing the Haier hOn app home screenHaier Heat Pump Error Codes: Meanings, Causes, Fixes & What to DoWorcester Bosch error codes explained guide tile: the Bosch EasyControl thermostat on its stand with its wall baseWorcester Bosch Heat Pump Error Codes: Meanings, Causes, Fixes & What to DoHeat Pump Smells Burning guide tile: an electrician's clamp meter on a workbench with cables and a junction boxHeat Pump Smells Burning: What to DoHeat Pump Compressor Problems guide tile: an outdoor unit on the ground beside a blue-painted buildingHeat Pump Compressor Problems: Signs, Causes & Repair CostsHeat Pump Making Noise? guide tile: a large outdoor fan unit mounted on the side of a buildingHeat Pump Making Noise? Common Sounds ExplainedHeat Pump Losing Pressure guide tile: close-up of a radiator with its thermostatic valveHeat Pump Losing Pressure: Causes & How to Fix ItRunning But Not Heating? guide tile: a row of white outdoor units in a shrub-lined gardenHeat Pump Running But Not Heating? 8 Causes & SolutionsHeat Pump Error Codes guide tile: heating controller displaying settings on a wooden surfaceHeat Pump Error Codes: Common Fault Codes ExplainedFrozen Outside Unit guide tile: metal grille encased in ice after freezing weatherHeat Pump Frozen Outside Unit: What to DoWhen to Replace Your Heat Pump guide tile: a white outdoor unit on a metal stand against a wallWhen to Replace Your Heat Pump: Signs It’s Time for a New SystemHeat Pump Short Cycling guide tile: a close-up of an outdoor unit's casing in bright sunshineHeat Pump Short Cycling: Causes, Risks & SolutionsHeat Pump Defrost Cycle guide tile: dark box unit buried under thick snow beside a houseHeat Pump Defrost Cycle: Why It Happens & What It Looks LikeHeat Pump Leaking Water guide tile: a white outdoor unit with a round fan grilleHeat Pump Leaking Water: Causes & What to DoHeat Pump Not Working? guide tile: outdoor unit beneath a window on a rendered wallHeat Pump Not Working? 10 Common Causes & Fixes

Installation

Sizing, placement, certification, planning permission and what happens on installation day.

Heat Pumps for Single Storey Extensions guide tile: blockwork extension under construction with a radiator against the wallHeat Pumps for Single Storey Extensions: Planning TipsChoosing a Heat Pump Installer guide tile: new houses on an estate with a wildflower green in frontChoosing a Heat Pump Installer: 10-Point ChecklistBest Location for an Air Source Heat Pump guide tile: air source heat pump units positioned on a lawn beside a houseBest Location for an Air Source Heat Pump: Placement GuideHeat Pump Pipe Sizing guide tile: steel pipework with a pressure gaugeHeat Pump Pipe Sizing: Getting the Flow Rates RightHeat Pump Planning Permission guide tile: georgian terrace painted in pastel coloursHeat Pump Planning Permission UK: Do You Need It?Heat Pump Size Calculator guide tile: aerial view of a suburb of houses among treesHeat Pump Size Calculator: How to Choose the Right kWHeat Pump Commissioning guide tile: hand tools laid out in a bag and on a toolboxHeat Pump Commissioning: What Should Happen at InstallationHeat Pump Electrical Requirements guide tile: electrical cable emerging from a rough plaster wallHeat Pump Electrical Requirements: What You Need to KnowHeat Pump Installation Process guide tile: grey air source heat pump outdoor units mounted along a building wallHeat Pump Installation Process: Step-by-Step Guide

Servicing & Maintenance

Annual service checklists, seasonal maintenance and settings that keep your heat pump efficient.

Best Heat Pump Settings When You Go on Holiday guide tile: radiator beneath a sunny window in a plant-filled roomBest Heat Pump Settings When You Go on HolidayHeat Pump Summer Maintenance Guide guide tile: outdoor unit surrounded by ferns and greeneryHeat Pump Summer Maintenance GuideHeat Pump Annual Service Checklist guide tile: two pressure gauges mounted on a wallHeat Pump Annual Service Checklist: What Should Be DoneHeat Pump Efficiency Check guide tile: bedroom radiator below a window looking out onto snowHeat Pump Efficiency Check: Is Your System Performing?How to Choose a Heat Pump Installer guide tile: terrace of stone houses beside a parkHow to Choose a Heat Pump Installer in the UKWeather Compensation for Heat Pumps guide tile: wall-mounted digital heating thermostatWeather Compensation for Heat Pumps: How It Works & Why It MattersHeat Pump Powerflush guide tile: close-up of a corroded cast-iron radiatorHeat Pump Powerflush: When & Why You Need OneHeat Pump Lifespan guide tile: a white and black outdoor unit standing outside a buildingHeat Pump Lifespan: How Long Does an ASHP Last?Heat Pump Winter Tips guide tile: snow-covered trees and rooftops in a residential streetHeat Pump Winter Tips: Keep Your ASHP Efficient in Cold WeatherWhy Heat Pump Servicing Is So Important guide tile: outdoor unit fitted low on a wall among ivyWhy Heat Pump Servicing Is So Important

Brand Reviews

Engineer reviews and comparisons of the heat pump brands we service every day.

Viessmann Vitocal guide tile: a Viessmann Vitocal outdoor unit on a floor console beside a white houseViessmann Vitocal Heat Pump Review 2026Best Heat Pump Brands in the UK guide tile: outdoor heat pump units beside a pair of modern white housesBest Heat Pump Brands in the UK 2026: Ranked & ReviewedPanasonic Aquarea guide tile: a black Panasonic Aquarea outdoor unit on pale paving against timber claddingPanasonic Aquarea Heat Pump Review 2026Grant Aerona guide tile: three black Grant Aerona outdoor units of different sizes on a decked terraceGrant Aerona Heat Pump Review 2026Worcester Bosch guide tile: a Worcester Bosch outdoor unit on a plinth against a house wall with roses in frontWorcester Bosch Heat Pump Review 2026LG Therma V guide tile: an LG Therma V outdoor unit on a stand beside the rendered corner of a house with lawn and gravelLG Therma V Heat Pump Review 2026Daikin Altherma guide tile: a Daikin Altherma monobloc outdoor unit against timber cladding with a lawn in frontDaikin Altherma Heat Pump Review 2026Samsung EHS guide tile: a Samsung outdoor unit against a yellow rendered wall on a patioSamsung EHS Heat Pump Review 2026Mitsubishi Ecodan guide tile: a Mitsubishi Ecodan outdoor unit on a base beside a houseMitsubishi Ecodan Heat Pump Review 2026Vaillant aroTHERM Plus guide tile: a Vaillant aroTHERM plus outdoor unit on paving beside a white houseVaillant aroTHERM Plus Heat Pump Review 2026Nibe guide tile: two NIBE outdoor units side by side on a brick-edged bed in a paved courtyardNibe Heat Pump Review 2026: The Premium Swedish Choice

News & Industry

Policy changes, market data and research on heat pumps in the UK.

Real-World Heat Pump Performance guide tile: a row of houses with snow on the groundReal-World Heat Pump Performance: UK Research & DataHydrogen Boilers vs Heat Pumps guide tile: row of terraced houses beside a riverHydrogen Boilers vs Heat Pumps: Which Is the Future of UK Heating?Gas Boiler Ban UK guide tile: colourful terraced houses on a London streetGas Boiler Ban UK: What It Means for HomeownersUK Heat Pump Market guide tile: rooftops of red-brick terraced houses seen from aboveUK Heat Pump Market 2025: Stats, Growth & Outlook

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