WTW.nl
Maintenance · all brands

Clean filters, quiet unit.

We service all brands and models. Filters, fans, ducts, heat exchanger, all like new again, in one visit.

Filters vervangenInregelenAlle merken
4.5 / 5 on Trustpilot (56 reviews)·Since 2018 ·Maandelijks opzegbaar

Recent · Onderhoudsbeurt Amersfoort

Filters, kanalen, regeling in één bezoek.

Service · Amersfoort
Filter replacementHeat exchanger cleanedFans inspectedCommissioning verifiedVisual duct inspectionEmail report

We service ALL HRV brands

Not just Zehnder or Renson, also Brink, Itho, Vasco, StorkAir, Duco and any other brand. One party for all your ventilation.

1.000+
services per year
All
brands & models
60–90 min
per service
4.5 / 5
on Trustpilot

Prices

Two ways to keep your HRV healthy.

Small maintenance

€ 390

excl. VAT · per visit

  • Check + balance + clean valves
  • Filters chosen separately (€ 32)
  • Original F7/G4, no B-brand
  • Report by email
  • No subscription, no obligation
Schedule small maintenance
Aanbevolen

Maintenance contract

€ 29.50

excl. VAT / month

  • Original F7/G4 filters every 6 months
  • Thorough cleaning every 24 months
  • Priority on call-outs
  • Cancel monthly
  • Saves money vs. ad-hoc visits
Start contract

Large maintenance

€ 545

excl. VAT · per visit

  • Full service visit
  • Filters, fan, heat exchanger
  • Valves and commissioning
  • Duct cleaning (+ € 390 optional)
  • Full report with photos
Schedule large maintenance

Original F7/G4 filters, never B-brand

We use only original factory filters. Keep your system clean, energy-efficient and your warranty valid.

Why maintenance?

A dirty HRV costs you more than you think.

Clogged = loudDirty filters force fans to spin harder. Result: noise and higher consumption.
Poor air qualitySaturated filters do nothing. Pollen, fine dust and mould come straight in.
Breaks down soonerBearings wear faster in dusty units. A service visit extends lifespan by years.

What is included?

One visit, everything checked.

Filter replacementF7 filters matching your system, quality filters, no budget brand.
Heat exchangerCleaned or rinsed. Crucial for efficiency.
FansChecked for wear, bearings, balance, rotation.
CommissioningVolume measured per valve and adjusted if needed.
ValvesQuanda-effect valve € 23 each if replacement needed.
Email reportWhat was done, before/after filter photos, advice.

Frequently asked questions

Answers to the most common questions.

How often do I need maintenance?
Replace filters every 6–12 months (depending on type). Small maintenance every 2 years is ideal. Large maintenance every 4–6 years, depending on condition. More often with intensive use (smokers, pets).
Do you service all brands?
Yes. While we install Zehnder and Renson, we service all brands, Brink, Vasco, Itho, StorkAir and more.
What does a single service cost?
Small maintenance from € 390 excl. VAT (filters separate € 32). Large maintenance € 545 excl. VAT all-in.
Is a maintenance contract required?
No. But it saves money annually vs. one-off services and gives priority on call-outs. Cancel monthly so no risk.
Which filters do you use?
Only original F7/G4 filters (fine + coarse dust), factory-equivalent, never B-brand. Keeps your warranty valid and your system energy-efficient.
How long does a service take?
Average 60–90 minutes for a home. 2–3 hours for commercial or larger installations. We plan a time slot, not a vague half-day.

The light test

Why we never fit a B-brand filter.

Two filters of the same size, held against the window. One lets noticeably more light through. More light means less filter material, and less material means less of the fine dust, pollen and soot that your unit is supposed to catch.

Two HRV filters held against the light: the non-original on the left passes visibly more light than the original on the rightNon-originalOriginal
Our own photo, taken during a service call. Left: more light through the pleats. Right: denser material, so darker.

What you are looking at

  • Left, non-original. The pleats pass more light. Thinner media, so a larger share of the fine dust simply goes through.
  • Right, original. Noticeably darker, right down to the darkest spots between the pleats. That is filter material doing its job.

And your warranty

Fabricators such as Zehnder prescribe original filters. Fit a B-brand and you risk more than dirty air: a unit that fouls faster, fans that have to work harder, and a manufacturer who can point at the filter when something breaks. That is why we only fit original F7/G4 filters, on every service, on every brand.

The same two HRV filters held up against a window, seen from further back

Schedule your maintenance visit.

Reply within 24 hours. Fixed price, no surprises.

Price guide

  • Small service € 390 · full service € 545
  • All brands, incl. Brink, Itho, Duco
  • Genuine filter set from € 32

Final price always follows a free on-site survey. No obligation.

Reply within 24 hours. No obligation, no pushy sales.
1. Your details
Estimated total
€ 390,-excl. VAT
Final after a short intake. We call within 1 business day.

We only call to discuss your request. No newsletters, no spam.

Prefer to call?

085 060 22 97WhatsApp

Official dealer Zehnder · Renson·First in NL with ComfoClime-certificate

Trustpilot 4.5/5 (56 reviews) · Google 5.0/5 (7 reviews) · 800+ installations · Since 2018