17 tips to save on heating–updated March 2022

Photo by he gong on Unsplash

A list with tips to save on heating

Do these things once:

  • Radiatorfoil (30 minutes, 20 euro, less than a year to get your money back). There are two types of radiator-foil: either you stick it on the wall, or you stick it to the back of the radiator with magnets. The latter one works best and looks a lot better. Stop heating your wall and heat your room instead!
  • Tube isolation (30 minutes, 20 euro, less than a year). These grey tubes cost a euro per meter at my local hardware store. Make sure you get the right width. Easily cut them with a knife and tape it up. They keep the warmth inside the tubes. For attics and underneath your house, or rooms you don’t heat very often.
  • Radiator ventilator (10 minutes, 50–105 euro, unknown ROI). It’s a simple idea: place ventilators under your radiators and the heat gets distributed more quickly in your room. I’ve got them in our living room and they make a much more comfortable home.
  • Set your CV to 60 degrees (10 minutes, free, ROI immediately). Your CV most likely has two temperature settings: for warm tap-water and for radiators. The factory-settings are always too high and can be set lower. The tap-water can be set to 60 degrees (never lower because of legionella risk!). The radiator-temperature can be set to 60 degrees as well: lower in the summer (40 degrees) and higher in an extremely cold winter (80 degrees when it’s less than -5 degrees outside).
  • Investigate ‘waterzijdig inregelen’ (half a day, 120 euro, ROI in one year). It is highly likely your radiators are not set to the most optimal setting. Optimizing the installation can be done manually, but explaining this goes way beyond this article 😅. You can get government subsidies for ‘inregelen’ if you do this together with a bigger investment like floor-isolation.
  • Foil for single-pane glass (30–60 minutes, 20 euro, ROI in one year). If your house still has single-pane glass, it’s better to replace it with double- or triple-pane glass. But if that’s not possible, you can do a temporary solution with this foil. It’s easy, and even fun to do (no really!), all you need is scissors and a hair-dryer.
  • Kill all drafts (30–60 minutes, 20 euro, ROI immediately). Any window with a small opening creates a draft. These self-adhesive strips stop those drafts. There are a lot of different types.
  • Set thermostat to 18,5 degrees (1 minute, immediate ROI). You most likely have a thermostat in your living room. You can live comfortably in a room with a temperature 18,5 degrees or lower, if you implemented all the measures above. Keeping a steady temperature is better than turning the thermostat up and down. Radiators only heat up if the room temperature goes below your thermostat setting and they stay on for as long as necessary to reach the temperature. If you’re cold, you don’t need to turn the thermostat way up, just nudge it up with .5 degrees.
  • Turn the thermostat down at night and on holiday. If you live in an old house (pre-1995), then it’s worth setting the thermostat lower during the night and when you’re on holiday, for example 15 degrees Celsius. It’s best to program your thermostat to do this for you instead of doing this manually.
  • Bonus-tip: replace all lamps with LED (30–60 minutes, 10–50 euro, immediate ROI). Any lamp that’s not an LED is a power-waster. Replace them immediately. LEDs last nearly forever, so it’s worth using a more expensive brand; cheaper ones can introduce a flicker when you’re recording movies with your phone.

Keep doing these things:

  • Set radiators low or off in your bedrooms and other rooms. It’s healthier to sleep in a room that has a temperature of 16–18 degrees (use thicker blankets instead of jacking up the radiator). Set radiators to the lowest amount you find comfortable, or turn them off completely. Note that at least three radiators need to be open for your CV to work optimally and make sure no room ever goes below 0 degrees, otherwise your radiators will break!
  • Shower less, and use low temperature. It’s healthier and better for your skin to shower less (every other day, for instance) and use lower temperatures. You can use a ‘shower timer’. Apparently ending your shower with a burst of cold water is good for you.
  • Ventilate your rooms. Keep a window open in your bedrooms, and open a window for at least 20 minutes in your living room.
  • Use an electric water boiler to boil water when you’re cooking: heating water in a pan on a stove is inefficient!

Do these things once a year:

  • Repressurize your CV (see below)
  • Have a professional maintain your CV. This is compulsory! Also ask the maintenance person if your CV is set properly: is the outgoing water temperature 20% warmer than the incoming water? This is necessary to give the CV a high efficiency (ask your professional about ‘waterzijdig inregelen’, see above). The professional can also repressurize your CV if you don’t want to do it yourself.
  • Clean your radiators. Mainly for health-reasons, but I bet it helps with efficiency as well.
This is how I clean my radiators :D

Addendum: taking the air out of the central heating and refill with water

  1. Check the water pressure: if below 1.5 bar, refill water first (see step 6)
  2. Turn on all radiators, set thermostat higher so hot water flows through all radiators
  3. Wait 30 minutes for the radiators to heat up
  4. For each radiator: use a special key (see photos below) and open the valve (see photo). Careful: the water is hot! You only need to open it a little bit: first air comes out, then it sputters, then water flows. Close the valve when the water flows! Start with the radiator that’s placed lowest in your house and work your way up. If no water starts flowing, you may need to fill your CV (step 6) before moving on to the next radiator
  5. Open the valve on your “expansion vat” (check photo below), and let all the air out, just like you did with the radiators. After letting the air out: tap on the top part and the bottom part of the vat. These parts should make different sounds, if they don’t, your expansion vat is broken…
  6. Refilling the central heating! This part can be tricky, read carefully:
  • First locate these five things: the valve that provides water, the valve for letting in water into the CV, the hose, a bucket and a dirty towel (check the photo!).
  • Connect the hose to the water inlet, open the valve and fill the hose with water (otherwise you’ll add air to the CV!), now connect the hose to the water inlet of the CV.
  • If everything is connected, open the valve of the CV and let the water flow. Check the barometer: your pressure should be between 1,5 and 2 bar. Older CVs needed to be turned off for this, newer ones don’t.
  • Turn off the valve for the water inlet AND the valve for providing the water. Keep your towel and bucket ready! Bend the hose close to the inlet, unscrew it, drop it in the bucket and let the water out
  • Take the hose off of the inlet. Don’t leave it connected: you can develop legionella in there

The photos for repressurizing

My water-pressure is 1.5 bar
This magical key opens up the radiator valves. It also opens up portals to Narnia, if you’ve got the right closet
Impress your friends by repressurizing your radiators yourself
My expansion-vat. This is an oldie, yours is probably red!
1: the valve that provides water (I have to disconnect the washing machine), 2: the hose that’s going to connect numbers 3&4, 4: the valve that lets the water in, 4: a bucket and an old towel. These are the ingredients for a successful refilling.




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