Real homeowner questions, answered.
A growing library of straight answers to the eco-home questions UK homeowners are actually asking, with figures cited from Ofgem, gov.uk and the Energy Saving Trust.
Boilers & Heating 58
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What does a combi boiler cost to run per year?
The typical annual running cost for a gas combi boiler in a three-bedroom semi-detached home is £870 to £1,050 as of early 2025, based on Ofgem's…
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How often should I service my gas boiler?
You should have your gas boiler serviced once every 12 months by a Gas Safe registered engineer. This is a legal requirement for landlords, but for…
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What temperature should I set my heat pump to?
For an air source heat pump, the most efficient flow temperature is typically between 35°C and 45°C, while your room thermostat should be set to your…
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Are air source heat pumps loud?
No, modern air source heat pumps are not loud by typical UK household standards. Most units produce between 40 and 60 decibels (dB) at 1 metre, which…
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How much electricity does a heat pump use per day?
A typical air source heat pump in a UK home uses between 10 and 30 kWh of electricity per day during the heating season, according to the Energy…
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How long do air source heat pumps last?
An air source heat pump typically lasts 15 to 20 years, with the outdoor unit often requiring replacement after around 15 years. The UK Energy Saving…
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Will hydrogen boilers replace gas in the UK?
No, hydrogen boilers will not replace gas boilers in UK homes on a mass scale, with the government now prioritising heat pumps over hydrogen for…
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What is the UK Clean Heat Market Mechanism?
The UK Clean Heat Market Mechanism (CHMM) is a government policy requiring boiler manufacturers to sell a rising percentage of heat pumps each year,…
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Can I keep my old boiler past 2035 in the UK?
The short answer is yes, you can keep your existing gas boiler past 2035, but you will not be able to buy a new standalone fossil-fuel boiler to…
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What is the lifespan of an air source heat pump in the UK?
An air source heat pump typically lasts between 15 and 20 years in the UK, according to the Energy Saving Trust (Energy Saving Trust, 2026). This is…
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Hybrid solar PV and heat pump, does it pay back in the UK?
Hybrid solar PV and heat pump systems can pay back in the UK within 8–14 years, depending on your property and usage patterns, according to the…
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Can a heat pump replace storage heaters in a UK flat?
The short answer is yes, a heat pump can replace storage heaters in a UK flat, but the cost and practicality depend heavily on your flat’s…
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Do I need planning permission for an outdoor heat pump unit?
Yes, most air source heat pumps in England are permitted development and do not need planning permission, provided they meet specific size, siting…
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Best heat pump for a Highland Scottish home in 2026
The best heat pump for a Highland Scottish home in 2026 is an air-to-water heat pump with a minimum Seasonal Coefficient of Performance (SCOP) of…
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Air source heat pump in a Welsh stone cottage, is it viable?
The most-searched figure is that an air source heat pump (ASHP) can cut heating costs by up to 30% versus oil in a typical Welsh stone cottage, but…
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Does underfloor heating work well with a heat pump in the UK?
Yes, underfloor heating works exceptionally well with a heat pump in the UK, and it is the most efficient pairing available for most homes. Heat…
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Why is my boiler kettling?
Boiler kettling is usually caused by limescale or sludge buildup inside the heat exchanger, restricting water flow and causing localised overheating,…
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How do I fix low boiler pressure in the UK?
To fix low boiler pressure in the UK, you simply repressurise the system using the filling loop, which should bring the gauge back to between 1 and…
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Is boiler cover insurance worth it in the UK in 2026?
Boiler cover insurance is not worth it for most UK homeowners in 2026, as the average annual premium of £275 exceeds the typical cost of a single…
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Is a magnetic boiler filter worth fitting in a UK home?
Yes, a magnetic boiler filter is worth fitting in most UK homes with a combi or system boiler because it traps magnetite sludge that reduces…
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What is a power flush and do I need one before a new boiler?
You may need a power flush before a new boiler if your heating system contains sludge, debris, or corrosion, as it clears blockages to protect the…
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What is the difference between air-to-air and air-to-water heat pumps?
An air-to-water heat pump heats radiators and hot water, while an air-to-air heat pump heats air blown into rooms via fan units and cannot provide…
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Can I install a heat pump in a UK flat or apartment?
Yes, you can install a heat pump in many UK flats and apartments, but it is not always straightforward. According to the UK government, air-source…
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Should I pair a battery with my heat pump?
No, pairing a battery with a heat pump is not essential, but it can reduce your annual electricity costs by around 20-30% if you have a time-of-use…
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What is the cheapest electricity tariff for running a heat pump in the UK?
The cheapest electricity tariff for running a heat pump in the UK is a dedicated heat pump tariff, which typically offers rates 10–20% lower than…
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Can I get a heat pump grant if I rent in the UK?
The short answer is yes, but only if you are a private tenant and your landlord agrees to install the heat pump. The Boiler Upgrade Scheme (BUS) in…
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How much does a hybrid heat pump cost to install in the UK?
The typical installed cost of a hybrid heat pump system in the UK is between £7,000 and £14,000, depending on the size of the heat pump and the…
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Will installing a heat pump improve my EPC rating?
Yes, installing a heat pump will improve your EPC rating, typically by 10–20 points depending on your current heating system and property efficiency.…
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What is the best gas boiler to buy in the UK in 2026?
The best gas boiler to buy in the UK in 2026 is a high-efficiency condensing model from a manufacturer approved by the Energy-related Products (ErP)…
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Worcester Bosch vs Vaillant – which is the better UK boiler in 2026?
Worcester Bosch and Vaillant are both top-tier boiler brands in the UK, but based on 2026 reliability data and warranty terms, Vaillant edges ahead…
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How long does a new boiler installation take in the UK?
A new boiler installation in the UK typically takes one working day for a straightforward like-for-like swap, though more complex jobs can extend to…
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How do I bleed a radiator – step by step UK guide?
To bleed a radiator in the UK, you need a radiator key, a cloth, and about five minutes, the process is the same for most homes with a pressurised or…
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What temperature should I set my thermostatic radiator valves (TRVs)?
The most efficient TRV setting for living areas is a '3' (around 20°C), with bedrooms set to '2' (around 16°C) and unused rooms to '1' or frost…
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How much does an electric boiler cost to run in the UK?
The average running cost of an electric boiler in the UK is between £1,200 and £2,400 per year for a typical three-bedroom home, based on electricity…
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Combi vs system vs regular boiler – which is best for a UK home?
For most UK homes, a combi boiler is the best choice because it heats water on demand and requires no separate tanks, but a system or regular boiler…
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Will my existing radiators work with a heat pump?
No, your existing radiators will likely work with a heat pump, but they will usually need to be oversized or upgraded to deliver the same heat output…
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Can heat pumps cope with UK winter temperatures?
The answer is yes: modern heat pumps are built to operate effectively in UK winter temperatures, with most models maintaining a Coefficient of…
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What is the difference between heat pump COP and SCOP?
Heat pump COP (Coefficient of Performance) measures efficiency at a single outdoor temperature, while SCOP (Seasonal Coefficient of Performance)…
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What hot water cylinder size do I need with a heat pump?
The most common hot water cylinder size for a UK home with a heat pump is 200–250 litres, as heat pumps heat water more slowly than gas boilers and…
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Do I need bigger radiators for a heat pump in the UK?
Yes, you almost certainly need bigger radiators for a heat pump in the UK. Heat pumps operate at lower flow temperatures (typically 35°C–45°C) than…
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How noisy are air source heat pumps?
Air source heat pumps produce noise levels of 40-60 decibels at 1 metre, comparable to a modern fridge, and UK rules require them to meet a 42 dB(A)…
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Is a hybrid heat pump system worth it in the UK?
Yes, a hybrid heat pump system is worth it for many UK homes, but the answer depends on your property's heat loss, existing heating system, and…
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Which are the best heat pump brands for UK homes in 2026?
The best heat pump brands for UK homes in 2026 are Mitsubishi Electric, Daikin, and Vaillant, based on reliability, efficiency, and installer…
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Air source heat pump vs gas boiler running costs in the UK
An air source heat pump (ASHP) typically costs between £400 and £800 per year to run, compared to £900 to £1,200 for a gas boiler, making the heat…
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How heat pump system works?
A heat pump system works by using electricity to move heat from outside air, ground or water into your home, rather than burning fuel to generate it.…
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How much does it cost to repressurise a boiler in 2026?
Repressurising a boiler typically costs between £0 and £120 in 2026, with the average professional callout settling around £80 to £100. If you do it…
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Should I service my boiler annually if it is still under warranty?
The short answer is yes: most UK boiler warranties, including those from Worcester Bosch, Vaillant and Baxi, require annual servicing by a Gas Safe…
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What temperature should I set my UK combi boiler in winter?
For a UK combi boiler in winter, set the flow temperature to 60°C for radiators and 50°C for hot water. This balances comfort, efficiency and…
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How long should a UK gas boiler last in 2026?
The typical UK gas boiler lasts between 10 and 15 years, with 12 years being the average lifespan cited by the Energy Saving Trust (Energy Saving…
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Why is my boiler losing pressure overnight UK?
Your boiler is losing pressure overnight because of a leak in the sealed heating system, typically a dripping radiator valve or a pipe joint, not a…
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How common are heat pumps?
Heat pumps are installed in roughly 1 in 20 homes in the UK, with around 550,000 units in operation as of early 2026 (GOV.UK, 2026). This share is…
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How heat pumps work diagram?
A heat pump works by extracting heat from outside air, ground or water and transferring it indoors using a refrigeration cycle, achieving…
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How heat pumps work?
A heat pump works by extracting heat from the outside air, ground, or water and transferring it indoors, using electricity to power the process…
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How long heat pump defrost cycle?
Air source heat pumps typically defrost for 2 to 15 minutes per cycle, with most units completing a defrost cycle in under 10 minutes. The Energy…
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How heat pump works in hvac?
An air source heat pump works by extracting heat from outside air and transferring it indoors using a refrigeration cycle, achieving efficiencies of…
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How many heat pumps are installed in the uk?
As of 2026, over 1.2 million heat pumps have been installed in UK homes, according to the latest data from the Department for Energy Security and Net…
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Is heat pump hot water worth it?
A heat pump hot water cylinder is worth it for most homes off the gas grid, cutting water-heating costs by up to 50% compared to a standard electric…
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How much heat pump cost to run?
A typical air source heat pump costs between £550 and £1,200 per year to run for a three-bedroom home, depending on your electricity tariff and the…
Written and edited by a named human
Each entry is written and edited by Ian Duncan, the site's founder. Costs and grant figures are cited from gov.uk, Ofgem and the Energy Saving Trust. Read more about the site.