Heating & Plumbing Before the Frost: Get Your Amsterdam Apartment Winter-Ready
CV-ketel service costs, why half your radiators stay cold, and how to stop pipes freezing — plus when to call a professional.
There's a pattern to Amsterdam winters, and every heating engineer knows it. October: quiet. First frost in November: the phone doesn't stop. The boilers that limped through summer fail on the coldest night of the year, the radiators that "always took a while to warm up" now never do, and someone's garden tap has quietly split its pipe.
The winter threads on Amsterdam forums write themselves: a homeowner without heating or hot water because his new CV-ketel can't be connected to a shared flue; a buyer whose hall and living-room radiators don't heat at all on a single-pipe system; a maintenance company refusing to service an awkwardly placed boiler. All of these were discovered in winter. All of them were findable in October.
This is the heating-and-plumbing half of winter preparation — what to check, what it costs in 2026, and which of these jobs you should not do yourself. For drafts, windows and insulation, start with the complete winter-prep checklist.
Your CV-ketel: service it before it matters
The gas combi boiler (CV-ketel) in your kitchen cupboard heats both your radiators and your shower. It's also a gas appliance that most people ignore until it stops — or worse, until it burns dirty.
Why annual service matters: Dutch guidance recommends a maintenance check every year for boilers older than two years. A serviced boiler burns cleaner and more efficiently (roughly €80–€150 a year in gas), fails far less often, and — the part that actually matters — gets checked for carbon monoxide risks. CO incidents in the Netherlands cluster in heating season, in exactly the kind of older, improvised installations Amsterdam specializes in.
What it costs in 2026: a one-off service visit runs roughly €70–€135. Maintenance contracts cost about €50–€90 per year for a basic version, up to €130–€200 for all-in contracts that include repair callouts — worth considering if your boiler is over ten years old. Renters: boiler maintenance is the landlord's responsibility, so your job is one email in September asking when it was last serviced.
While you're at it, check these yourself:
- Pressure: the gauge should read 1.5–2 bar when cold. Below 1 bar, top it up via the filling loop (your boiler manual shows how) — but if you're topping up every few weeks, the system is leaking somewhere. That's a pro visit, not a habit.
- Error history and noises: a boiler that kettles, bangs or resets itself in October will pick the worst week of January to die.
- The flue question: if you're replacing a boiler in an apartment block, the flue (rookgasafvoer) is often shared and often the complication. Involve the VvE before ordering a new ketel, not after the old one is off the wall.
Book it now, not in November. Service capacity in Amsterdam disappears the week the temperature first drops. An October appointment is routine; a January breakdown is an emergency callout at emergency rates — and that's if you avoid the emergency-repair scammers who thrive on exactly this panic.
Radiators: cold tops, cold bottoms, cold rooms
Radiator complaints come in three flavors, and the fix is different for each.
- Cold at the top, warm at the bottom → air. Bleed the radiator with a radiator key: heating off, open the valve until water replaces the hissing, close it, then check the boiler pressure (bleeding lowers it). Five minutes per radiator, and legally the tenant's own job in a rental. Do the top-floor radiators last — air collects there.
- Warm at the top, cold at the bottom → sludge. Years of corrosion settle as black sludge that blocks circulation. Not a DIY fix: a heating engineer flushes the radiator or the whole system. If the water runs black when bleeding, mention it when you book.
- Some rooms hot, some rooms cold → an unbalanced system. The radiators closest to the boiler steal the flow; the far ones starve. Hydraulic balancing (waterzijdig inregelen) is a half-day professional job that improves comfort and cuts gas use — the standard answer to one tropical bedroom and one arctic living room.
- Thermostatic valves that do nothing: the pin underneath is often just stuck after the summer — remove the head and free the pin before calling anyone. If the valve is genuinely dead, replacement is a quick job for a pro.
Single-pipe systems (common in 60s–80s blocks) are their own specialty — poorly flowing bypass blocks, not broken radiators, are often the culprit. Find an installer who actually knows single-pipe systems before replacing hardware.
Pipes: the frozen-pipe prevention list
A burst pipe is the most expensive fifteen minutes of neglect in home ownership — and in an apartment building the damage is rarely limited to your own floor (see who pays when water goes wrong). Before the first frost:
- *Outdoor tap (buitenkraan):* close its indoor shut-off valve, open the outdoor tap, let it drain, leave it slightly open. If there's no indoor shut-off valve, having one fitted is a small plumbing job that pays for itself the first cold winter.
- Pipes in cold spots: any water pipe running through an unheated shed, storage box (berging), crawl space or against a single-brick exterior wall should be lagged with foam pipe insulation — €3 per meter, cut with scissors, no skill required.
- Going away in winter? Leave the heating on at 12–15 °C rather than off, keep interior doors open so warmth reaches pipe runs, and know that many home insurance policies expect exactly this. For long absences, closing the main valve and draining the system is the gold standard.
- *Find your main valve (hoofdkraan) today.* Usually near the water meter — under the stairs, in the meter cupboard, or in the downstairs hall in subdivided buildings. If yours is seized, painted over, or somewhere in a neighbor's basement (it happens in old Amsterdam splits), get that resolved in autumn.
If a pipe does freeze: close the main valve first, then thaw gently (hairdryer, warm towels — never a torch), and watch the thawed section for leaks; pipes usually split while frozen and only start spraying once thawed. If nothing flows and you can't find the frozen section, that's a professional's job — and a legitimate emergency callout.
Drains and gutters: winter is high season for blockages
Cold weather turns fat solid in kitchen drains, leaves fill the gutters, and December is when the gurgling starts. Slow drains you've been ignoring since summer get worse, not better — deal with them in autumn at normal rates. If your drain problem might be the building's rather than yours (multiple drains gurgling, neighbors affected), read when the VvE pays and when you do before commissioning hundreds of euros of pipe-cleaning on your own account.
The autumn booking list
- Annual CV-ketel service — installer or maintenance contract: €70–€135 one-off; contracts €50–€200/yr
- Bleed radiators, check pressure, lag accessible pipes, drain the outdoor tap — you: €10–€30 in materials
- Radiator flush, system balancing, stuck valves — heating engineer: 1–4 hours of specialist time
- Outdoor tap shut-off valve, pipe insulation in awkward spots, dripping taps, slow drains — handyman: one visit, up to €150 including the first hour
- Emergency breakdown in January — whoever answers the phone: emergency rates plus surcharges
That last line is the one this whole article exists to help you avoid.
One visit, the whole list: Tom's Klussen offers a winter heating & plumbing check for Amsterdam apartments — radiators bled, pipes lagged, outdoor tap winterized, small leaks fixed, and honest advice on whether your boiler needs a specialist. Price agreed upfront, booked around your schedule. Send me a message while October slots last.
Frequently asked questions
How much does CV-ketel maintenance cost in 2026?
A one-off service visit costs roughly €70–€135. Annual contracts range from about €50–€90 for basic cover to €130–€200 all-in including repair callouts.
Why are some of my radiators cold while others are hot?
Usually an unbalanced system: radiators near the boiler take most of the flow. Hydraulic balancing by a heating engineer fixes it and reduces gas use. Cold tops mean trapped air (bleed it yourself); cold bottoms mean sludge (professional flush).
How do I stop my pipes freezing in an Amsterdam apartment?
Drain and shut off the outdoor tap, insulate pipes in unheated spaces, keep the heating at a minimum of 12–15 °C during absences, and know where your main water valve is before you need it.
Whose job is boiler maintenance in a rental?
The landlord's. Tenants handle only small tasks like bleeding radiators. Ask your landlord in writing when the boiler was last serviced — annual maintenance is the Dutch norm for boilers older than two years.
When should I book a boiler service?
September or October. Once the first frost hits, installers across Amsterdam are fully booked and breakdowns are handled at emergency rates.