Heating
It is the question we get asked more than any other on a quote visit. You have had a gas boiler keeping the house warm for years so why would you look at anything else and would it actually cost less to run. It is a fair question and it deserves a straight answer rather than a sales pitch. The honest version is that it depends on your home, your habits and the way you heat, but once you understand how the two systems differ the comparison becomes a lot clearer.
At Air Con North we design, supply, install and maintain heating of both kinds across the North-East, so we have no axe to grind either way. We fit what suits the building in front of us. This guide walks through how an air-to-air heat pump stacks up against a gas boiler on running cost and where each one earns its keep.
Two different ways of making a room warm
A gas boiler burns fuel. It takes gas, sets fire to it and uses the flame to heat water that then travels round the house through radiators. Burning is the key word. Every unit of gas you buy turns into roughly a unit of heat, and a good modern condensing boiler claws back a bit more from the flue gases, so you might get a shade over ninety percent of the energy in the gas into the room. That is about as good as burning can do. You cannot beat the laws of physics by lighting a bigger fire.
A heat pump does not burn anything. It moves heat that already exists in the outside air into your home using a refrigerant cycle, the same basic process that keeps your fridge cold only working the other way round. Because it is moving heat rather than making it, one unit of electricity can shift three or four units of heat indoors. That ratio is the whole game. It is why a heat pump can heat a room for less than the raw cost of the electricity suggests.
It helps to picture the two side by side. The boiler is a furnace with pipes running off it, a closed system full of hot water pushed round the house by a pump. The heat pump is more like a conveyor belt for warmth, picking heat up outdoors and setting it down indoors with a small motor driving the loop. One is fundamentally limited by how much energy is locked in the fuel. The other is limited only by how cleverly it can gather and concentrate heat that is already out there for free. That is a very different sort of ceiling and it is why the running cost works out the way it does.
Why efficiency matters more than fuel price
People tend to compare the price per unit of gas against the price per unit of electricity and stop there. Electricity costs more per unit than gas, so on that reading the boiler wins. But that comparison ignores the one thing that actually decides the bill, which is how much heat you get out for each unit you put in.
Run the sum properly. A boiler turning one unit of gas into roughly nine tenths of a unit of heat is doing well to break even against its fuel. A heat pump turning one unit of electricity into three or four units of heat is doing something a boiler simply cannot. Even with electricity priced higher per unit, moving heat three or four times over closes the gap and in many homes tips it the heat pump way. The colder it gets the more that ratio narrows, which we will come back to, but across a typical North-East year an air-to-air system is genuinely frugal.
The ratio engineers use for this is sometimes called the coefficient of performance, which is just a tidy way of saying how many units of heat you get for each unit of electricity. A boiler can never have a coefficient above one because it is burning fuel. A heat pump sits comfortably above one all winter and spends much of the milder weather well up towards four. When you hear that heat pumps are efficient, that number is what people mean. It is not marketing, it is simply the difference between moving something and manufacturing it from scratch.
One more thing muddies the picture and it is worth naming. Gas and electricity prices move around, and the ratio between them shifts over the years. Nobody can promise you where they will sit in a decade. What does not change is the physics. Whatever the two fuels cost, a heat pump will always get three or four times the heat per unit out that a boiler gets, and that built-in advantage is the part you can rely on when you are planning for the long haul.
Per-room heating versus the whole house
This is where the two systems part company in a way that affects both comfort and cost. A gas boiler and its radiators heat the whole house as one lump. You turn the heating on and in principle every radiator that is open starts warming its room whether anyone is in it or not. Zoning a wet system is possible but it is rarely done well in an ordinary home.
An air-to-air heat pump works room by room. Each indoor unit heats its own space and only its own space, and you control each one on its own. That changes the maths because most of us do not use every room at once.
- Heat where you are. If you spend the evening in the lounge there is no sense warming four empty bedrooms. Per-room control lets you heat the lounge and leave the rest cool.
- No wasted warm-up. You are not firing a whole system to get one room comfortable, so the energy goes where it is wanted.
- Different rooms, different needs. A home office that needs steady warmth through the day can run gently while bedrooms sit idle until bedtime.
For a couple in a large house this targeting can save a surprising amount. For a big family where every room is in use all evening the advantage is smaller because you are heating everywhere anyway.
There is a knock-on benefit too. Because you are only ever bringing one or two rooms up to temperature at a time rather than the whole house, each unit can run gently and steadily instead of a boiler firing hard to heat everything at once. Gentle steady running is where a heat pump is at its most efficient, so the per-room approach does not just cut waste, it keeps the kit in its sweet spot. A boiler, by contrast, tends to cycle on and off as it chases a single house thermostat, and that stop-start pattern is not the most economical way to run anything.
No flue, no gas, no combustion to worry about
Running cost is not only about the energy bill. A gas boiler brings obligations that a heat pump does not. There is an annual gas safety check, there is a flue carrying combustion gases out of the house and there is the small but real risk that comes with burning fuel indoors. None of that is a reason to panic about a well-maintained boiler, but it is worth weighing.
A heat pump has no flame, no flue and no gas supply feeding it. There is nothing being burned inside your home, so there is no carbon monoxide risk from the appliance and no combustion by-products to vent. The outdoor unit sits outside doing the work and the indoor units are simply moving warm air about. For many homeowners that peace of mind counts for a good deal, and for a property with no mains gas at all it removes the cost of bottled fuel or oil entirely.
When a gas boiler still makes sense
We are not going to pretend the boiler has had its day in every situation. There are homes where it remains the sensible choice, at least for now.
- Older, leaky properties. A draughty house with poor insulation loses heat fast and demands high output on cold days. A boiler and large radiators can brute-force that, whereas a heat pump works best when the fabric holds heat in.
- A recent boiler in good order. If you fitted a quality boiler a year or two ago there is little sense ripping out something that works. You would plan the switch for when it comes to the end of its life.
- Very high hot water demand. Air-to-air heat pumps heat and cool rooms but do not make your hot water, so a household with heavy hot water use will still want a separate solution for that side.
The right answer is often a considered one, matching the system to the building and to how long you plan to stay.
When the heat pump pulls ahead
On the other side there are homes where an air-to-air system is the clear winner on running cost and on comfort.
- Well-insulated homes. Modern or upgraded properties that hold their heat let a heat pump run gently and efficiently, which is exactly where that three or four to one ratio pays off.
- Homes off the gas grid. If you are on oil, bottled gas or electric heating already, a heat pump usually undercuts all of them comfortably.
- People who do not heat every room. Per-room control rewards anyone whose living pattern leaves parts of the house cool.
- Anyone who also wants cooling. The same units that heat in winter cool in summer, so you get two jobs from one install, which a boiler can never offer.
The direction of travel
Step back from the here and now and the longer trend is hard to miss. The country is moving away from burning gas in homes. New-build standards are pushing towards low-carbon heating, gas boilers face a gradual phase-down and the grid is steadily getting cleaner as more renewable generation comes online. Every year the electricity feeding a heat pump carries a little less carbon, which means the same appliance quietly gets greener without you lifting a finger.
That matters for a decision you might live with for fifteen years or more. Fitting a system now that works with where things are heading, rather than against it, is simply sound planning. It does not mean tearing out a working boiler tomorrow. It does mean that when the time comes to replace your heating, a heat pump deserves a proper look rather than an automatic like-for-like swap.
It is worth saying a word about what this does for the house itself. A home set up with efficient low-carbon heating tends to show well when the time comes to sell or let, because the running costs are lower and buyers are increasingly switched on to that. Fitting a system that also cools in summer adds a comfort most homes round here still do not have. None of that is the main reason to choose a heat pump, but it is a fair bit of value riding alongside the running-cost saving, and it is worth weighing in the balance.
Talk to Air Con North
Running cost comes down to your particular house, so the only way to give you a real answer is to come and see it. With over twenty-five years in the trade across Newcastle, Durham, Sunderland, Gateshead, Middlesbrough, Carlisle and the surrounding areas, we have fitted heating into every kind of property the North-East throws at us, from tight terraces to sprawling farmhouses. We will look at your insulation, how you use your rooms and what you have now, then tell you honestly whether a heat pump would save you money or whether your boiler is fine where it is. The survey and the quote are free and there is no obligation at the end of it. Give us a call on freephone 0800 246 5430 and we will arrange a time that suits you.
