Is een hybride warmtepomp stiller dan een volledige warmtepomp?

Meestal wel. Een hybride warmtepomp heeft een kleiner vermogen (vaak 3–5 kW) en dus een kleinere ventilator en compressor. Typische geluidsvermogens liggen rond de 50–58 dB(A), tegenover 58–65 dB(A) voor volledige lucht-waterwarmtepompen. Maar het verschil per model is groot — kijk altijd naar het LwA op het energielabel.

Gelden de geluidsnormen ook voor hybride warmtepompen?

Ja, volledig. De buitenunit van een hybride warmtepomp is een buiten opgestelde installatie voor warmteopwekking en moet dus voldoen aan maximaal 40 dB(A) op de perceelgrens in de avond en nacht, net als elke andere warmtepomp of airco.

Draait een hybride warmtepomp ook ’s nachts?

Ja. Juist in koude nachten draait de warmtepomp door (de cv-ketel springt alleen bij op de koudste momenten). De avond- en nachtnorm van 40 dB is daarom ook voor hybrides de maatgevende eis.

Hybrid heat pump noise: what will the neighbours notice?

The hybrid heat pump — a heat pump alongside the existing gas boiler — is the first step off gas for many Dutch homes. A common worry: will the neighbours get a hum with it? The honest answer: a hybrid also has an outdoor unit with a fan, but is on average clearly quieter than a full heat pump. More importantly: there is a verifiable legal limit.

The same limit as any heat pump

The outdoor unit of a hybrid heat pump is subject to exactly the same requirements as a full heat pump or air conditioner: at most 40 dB(A) at the plot boundary in the evening and night (19:00–07:00), and 45 dB(A) during the day provided silent mode covers the night. That a hybrid is "just a helper next to the boiler" makes no legal difference. The full explanation is on the noise limits page.

How loud is a hybrid heat pump?

Because a hybrid has limited capacity (usually 3 to 5 kW), the fan and compressor are smaller and the sound power is lower: typically 50 to 58 dB(A) LwA, where full air-to-water heat pumps often sit at 58 to 65 dB(A). That matters a lot: 5 dB less sound power nearly halves the required distance to the boundary. Still, "hybrid" is no guarantee — quiet full heat pumps and noisy hybrids both exist. Always check the LwA on the energy label, and the value in silent or night mode.

An often-forgotten point with hybrids: the unit runs precisely on cold winter nights, when gardens are quiet and bedroom windows are ajar. The 40 dB night limit is therefore the governing figure here too — not the sound on a busy summer day.

Placement: small unit, same rules

Because hybrid units are compact, they are often "tucked away" in a corner, against the fence or in a recess — acoustically the worst spots, since walls beam the sound towards the neighbours. Free-standing or against a single wall is better. See the distance table for the metres needed per sound power; all measures to reduce the noise further are in the noise reduction tips.

Calculate the intended spot for free

With the calculator on this site you draw your garden, drag the unit to the intended spot and instantly see the calculated level at every boundary point — plus the maximum sound power allowed there. So you know before the quote whether the desired spot is feasible, and with which type of unit.

Frequently asked questions

Is a hybrid heat pump quieter than a full heat pump?

Usually yes. A hybrid heat pump has less capacity (often 3–5 kW) and therefore a smaller fan and compressor. Typical sound power levels are around 50–58 dB(A), versus 58–65 dB(A) for full air-to-water heat pumps. But models differ a lot — always check the LwA on the energy label.

Do the noise limits apply to hybrid heat pumps?

Yes, fully. The outdoor unit of a hybrid heat pump is an outdoor heating installation and must stay under 40 dB(A) at the plot boundary in the evening and night, like any other heat pump or air conditioner.

Does a hybrid heat pump also run at night?

Yes. Especially on cold nights the heat pump keeps running (the gas boiler only assists at the coldest moments). The 40 dB evening/night limit is therefore the governing requirement for hybrids too.