In most cases, the question is decided before it is asked: in the Canton of Zurich, a renewable system is the rule when replacing gas heating – fossil fuels only remain for those who can prove the strictly defined exception. But even without the law, the calculation over the lifespan usually speaks in favour of the heat pump: higher investment, but lower and more stable operating costs, incentives instead of the CO2 levy – and the possibility of heating with your own solar power. (As of: July 2026)
Key points in brief
- Legally: Since 1 September 2022, a renewable system has been mandatory in the Canton of Zurich when replacing heating; the fossil exception requires proof of more than 5 per cent additional costs over the lifecycle.
- Economically: Gas heating wins at the beginning (lower investment), the heat pump over the years (operating costs, incentives, no fuel risk).
- The CO2 levy continually makes fossil heating more expensive – gas prices also depend on markets that nobody controls.
- Only the heat pump can run on self-produced solar power – this shifts the calculation permanently.
- The honest truth remains: There are buildings where the heat pump is not the first solution – but then gas is rarely the alternative, but rather district heating or wood.
Is the choice in the Canton of Zurich still open at all?
Only in exceptional cases. The cantonal energy law requires a renewable heating system when replacing the heat generator; anyone wanting to replace it with a fossil fuel system must prove that renewable is technically impossible or causes more than 5 per cent additional costs over the lifecycle – calculated using the official tool and checked by the municipality, and even then only in an energetically fit building. The details of the regulation are in a separate post.
In practice, this means: The comparison «heat pump or gas» in the Canton of Zurich is no longer a decision between two equal options, but the question of whether your building is an exceptional case. For the vast majority of single-family homes, it is not. The comparison remains interesting nonetheless – because it shows that even without the law, the calculation would usually have the same outcome.
How do investment and operating costs compare?
| Gas heating | Heat pump | |
|---|---|---|
| Investment | lower – boiler replacement in the existing system | higher, depending on the source (air or geothermal probe) |
| Incentives | none | Confederation/canton/municipality – the overview for Zurich |
| Energy costs | Gas price + CO2 levy, market-dependent | Electricity, sometimes at special heat pump tariffs |
| Recurring obligations | Burner service, chimney sweep, firing control | significantly leaner schedule |
| Price risk | imported fuel, levy path rising | Electricity price – mitigable with own PV |
| Lifespan calculation | cheap in the short term | usually cheaper over 20 years |
Assessment, As of: July 2026 – without CHF values, because both sides depend heavily on the building. The calculation for your property is binding; for the fossil exception, the official lifecycle calculation applies anyway.
The pattern is stable: gas heating wins the day of replacement, the heat pump the twenty years after. Anyone who only compares the quotes side-by-side is comparing purchase prices – but what is relevant are the total costs over the lifespan, and there incentives, lower maintenance costs and the CO2 levy all work in the same direction.
What does the CO2 levy do to the gas bill?
It is the silent item that is not in any boiler quote. A CO2 levy is levied on fossil fuels, which continuously burdens the gas price per kilowatt hour – and the political direction has been pointing upwards for years, not downwards. Add to this the market risk: gas prices have shown in recent years how quickly they can multiply, for reasons over which a homeowner has no influence.
The heat pump knows its own price risk – the electricity price. The difference: against rising electricity prices there is a tool on your own roof. Anyone who combines a heat pump and photovoltaics produces part of the heating electricity themselves; with gas there is no equivalent – nobody extracts gas in the garden.
Where is gas heating really ahead?
Honest answer: in three places, and none of them goes far. Firstly, the investment – a pure boiler replacement is cheaper and done faster. Secondly, space: no outdoor unit, no borehole, no noise issue. Thirdly, the flow temperature: a gas boiler does not ask whether the radiators are suitable for low temperatures.
Only: the last point is weaker than it seems – heat pumps work in more old buildings than their reputation suggests, and the practical test for this costs nothing. And where the heat pump really does not fit, district heating or a wood heating system are available as renewable alternatives. The constellation in which a new gas boiler of all things is the best remaining solution is becoming rarer from year to year.
When should you act – now or in the event of a defect?
Before the defect. The most expensive heating replacement is the emergency in January: those who plan during ongoing operation can compare systems, submit applications for incentives before the start of construction and choose the date themselves. Those who have to decide with a cold house take what is available – and in an emergency, experience shows that this is too often the fastest rather than the best solution. A gas heating system with fifteen or more years under its belt is therefore no reason to panic, but a reason for a plan.
The most frequent question in advisory consultations on heating replacement is not «heat pump or gas?», but «Am I even still allowed to use gas?» – and the disappointment with the answer rarely lasts long. If we go through the lifecycle calculation together – incentives, maintenance, CO2 levy, plus your own solar roof – the preference usually tips by itself. What remains is respect for the higher initial investment. This can be tamed better with planning and incentives than a gas price with world politics.
Frequently asked questions
My gas heating is still running – do I have to replace it?
No, the obligation only applies when replacing the heat generator. Repairs remain permitted. It still makes sense to plan the replacement before the defect rather than deciding in an emergency.
Does the exception for gas really still exist?
Yes, but strictly defined: proof via the official lifecycle tool, checking by the municipality and requirements for building efficiency. The hurdles are deliberately high – for the typical single-family home, the exception is rarely realistic.
What about biogas?
Cantonal law recognises solutions with a high proportion of biogas over the lifespan under certain conditions. Whether this is economically viable depends on the availability and price of the biogas product – check the small print of the supply contract carefully.
Isn't the heat pump too expensive in winter?
It needs the most electricity in winter, that is true – it remains efficient nonetheless, even in sub-zero temperatures. The annual calculation is decisive, not January. The honest assessment including the winter reservation: heat pump and PV.
Can I combine a heat pump and gas?
Technically yes – as a hybrid heating system. Whether this makes sense or only brings double costs is dealt with in the separate post on hybrid heating systems.
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Sources: Canton of Zurich (Energiegesetz, EN-LCC-ZH), Federal Office for the Environment (FOEN/BAFU) (CO2-Abgabe), EnergieSchweiz, FWS Fachvereinigung Wärmepumpen Schweiz.
Last updated: 9 July 2026 · Author: ecoEn editorial team
