A central heating boiler is usually installed with standard settings. With a few simple changes, you can adjust a central heating system to suit your own home. In this way you save energy and improve the comfort of your home. In technical terms we call this CV tuning. CV tuning comes down to the water-side adjustment of the heating installation. You make sure that the difference between the temperatures of the water supply and discharge between the central heating boiler and the radiators is set optimally. As a result, the central heating boiler does not have to work as hard and you save on your gas consumption. For an average household, this will quickly result in savings of 10% or more.
How long does CV tuning take?
A professional heating engineer usually needs about 2 hours to optimise the boiler. If you are a bit handy, you can work on your central heating installation yourself. But we recommend calling in help. It is safer and you can be sure that your central heating boiler will continue to function as it should. The first step in tuning a boiler is to check the current settings. In most cases, a heating installation is installed with pre-programmed standard settings. The capacity is often set at 90% while for most households a capacity of 40% is sufficient. By adjusting these settings, there is already an immediate and considerable gain.
By adjusting the heating system on the water side, the mechanic makes sure that the whole system is brought into balance. In most cases the radiators close to the boiler fill up quickly. This causes hot water to flow back to the boiler too quickly. That gives off the signal that the whole house is already up to temperature. The result is that the boiler will give off less heat. When you balance the heating system better, you ensure that the water is better distributed over all the radiators in the house. As a result, the water will flow back to the boiler less quickly - and at a much lower temperature. The installation is therefore better able to measure how much heating is actually still required.
What does a heating engineer do?
A professional heating engineer knows what the ideal temperature difference is between the supply of hot water to the radiators and the return of cooled water to the heating installation.
This is mainly a matter of measuring and will take some time. The professional will use an infrared thermometer to measure the right temperatures as quickly as possible and get results.
Besides the water side adjustment the installer will also look at the pump control of the central heating boiler. By default this is set to 100%. For most houses - certainly flats - this is totally unnecessary. Reducing the pump speed immediately results in savings. After all, the boiler will not have to work as hard and that saves on energy consumption.
A lower pump speed means that the water flows through the system more slowly. This also gives the radiators more time to give off sufficient heat. Most pumps have 3 settings and are set to level 3 as standard. For the vast majority of houses, level 2 will suffice. The lowest level sometimes results in insufficient pump capacity. But the central heating installer knows how to determine this. A too low water flow rate has negative consequences and can sometimes even be harmful. Our advice is therefore not to try this yourself.