A PVT module combines photovoltaics and solar thermal in one component: at the front it generates electricity like a normal solar module, at the back a circuit captures the waste heat and puts it to use – for example as a source for a heat pump. The idea is elegant, but in practice it's a niche: for most houses, separate systems are simpler and cheaper. PVT becomes interesting above all in combination with a heat pump. (As of: July 2026)
Key points in brief
- PVT stands for photovoltaic-thermal: a module that supplies both electricity and heat at once.
- The thermal part also cools the cells – and cooler cells work a little more efficiently.
- The heat gained is low-temperature and fits best as a source for a heat pump, not as ready-made hot water.
- PVT is more complex and more expensive than a pure PV system and therefore remains a special case.
- For most single-family homes, a good PV system – combined with a heat pump if needed – is the simpler route.
What is a PVT module?
A PVT module is two things in one: an electricity generator and a heat collector. The front holds the solar cells that turn light into electricity – as with any photovoltaic module, explained in the article How does photovoltaics work?. What's new is the back: there sits a heat exchanger through which a fluid flows, picking up the heat that builds up behind the cells.
That combines two techniques that otherwise go on the roof separately: photovoltaics for electricity and solar thermal for heat. The comparison of these two basic technologies is in the article Solar thermal or photovoltaics; PVT tries to harvest both benefits from the same area.
A pleasant side effect comes from the cooling. Solar cells lose output in heat – the hotter, the lower the yield, as described in the article on efficiency. Because the thermal circuit draws heat away from the cells, they run cooler and thus somewhat more efficiently. The heat isn't lost, then – it's used twice: once to cool the cells, once as energy gained.
What can the heat be used for?
For anything that works with low temperatures. The heat from a PVT module isn't hot – it sits at a low temperature level. That determines the sensible use cases.
PVT fits best as a source for a heat pump. A heat pump needs an ambient heat source that it raises to heating temperature; usually that's outdoor air or the ground. A PVT field can supplement or replace that source and give the heat pump a somewhat higher input temperature during the transitional seasons. How a heat pump and solar power work together in general is covered in the article Combining a heat pump & photovoltaics.
For direct hot-water production, the temperature level often isn't enough on its own – that would usually need auxiliary heating. That's the big difference from classic solar thermal, which delivers hot water in summer but generates no electricity. PVT plays to its strength where a heat pump is already working in the house anyway, one that can make use of low source temperatures.
Is PVT worthwhile for a normal single-family home?
In most cases, the simpler route is the better one: a good photovoltaic system, combined with a heat pump if needed. PVT is technically appealing, but more elaborate – and that extra effort has to pay off.
The reasons are sober. A PVT module is more complex than a pure PV module: it needs a second circuit with pipework, a pump and integration into the heating system. That costs more and needs to be professionally planned. On the plus side is the double use of the area – an advantage above all when the roof is small and you want to get a lot out of little area.
For the typical house with adequate roof area, the question looks different: there, a larger pure PV system plus a separate heat pump usually delivers more benefit per franc. PVT becomes interesting when several conditions come together – little area, a heat pump that benefits from the source, and the wish to bundle both on the same roof. A serious comparison always includes the pure-PV solution as a reference, rather than selling PVT as the automatically more modern system.
| Pure photovoltaics | Solar thermal | PVT (combined) | |
|---|---|---|---|
| Delivers | Electricity | Heat | Electricity + heat |
| Heat level | – | high (hot water) | low (heat pump source) |
| Complexity | low | medium | high |
| Area use | one use | one use | two uses |
| Typical application | Standard case | hot water without a heat pump | little area + heat pump |
Simplified comparison, as of: July 2026. Planning for the specific building is decisive.
PVT usually comes up in consultations when someone has read that a roof can do "electricity and heat at the same time" – and at first that sounds like the ideal solution. Our experience is more cautious. In the vast majority of homes in the Zurich region, people do better with a cleanly planned PV system and, wherever a heating system is due, a heat pump: simpler, cheaper, less maintenance. We take PVT seriously when roof area really is tight and a heat pump would benefit from the extra source. It's a good technology – but in the right place, and that's rare.
Frequently asked questions
Does a PVT module produce less electricity than a normal PV module?
Not necessarily – on the contrary, cooling from the heat circuit can even slightly support the electricity yield, because cooler cells work more efficiently. But the real added benefit lies in the heat gained. The exact figures depend heavily on the system and its integration.
Does PVT replace solar thermal for hot water?
Only to a degree. The heat from PVT sits at a low temperature level and usually needs auxiliary heating for hot water. Classic solar thermal delivers hot water directly in summer but generates no electricity. PVT is strong as a heat source for a heat pump, less so as a direct hot-water supplier.
For whom does PVT really make sense?
For houses with tight roof area that want to get both electricity and heat out of every square metre – ideally combined with a heat pump. Where enough roof area is available, a larger pure PV system plus a separate heat pump usually delivers more benefit per franc invested.
Is PVT a new, immature technology?
The combination has been around for years, but it has remained a niche product. That's less about maturity than about cost-effectiveness: the extra effort only pays off in certain constellations. Anyone using PVT should rely on a proven system and a specialist company experienced with it.
Can a PVT module generate heat and electricity at the same time?
Yes, that's exactly its principle: at the front, solar cells supply electricity; at the back, a heat exchanger carries away the waste heat. Both happen simultaneously, from the same roof area. The heat, however, sits at a low temperature level, so it suits a heat pump or preheating, not hot water without auxiliary heating. A side effect: because the cells are cooled, the electricity yield stays a bit more stable on hot days.
Can PVT be the heat source of a heat pump?
Yes, that's the most sensible use. A brine/water heat pump needs a low-temperature source, usually ground probes. A PVT field can supplement that source or – with enough area and the right sizing – replace it, and can even regenerate the ground probe in summer. For air/water heat pumps, by contrast, PVT brings little. Whether it works out for your house is a sizing question that planner and specialist company clarify together using the heat demand figures.
Free initial consultation
Electricity, heat – or both? We help you classify it.
We look at your roof area, heating and your goals, and tell you honestly whether a pure PV system, combining it with a heat pump, or a PVT system suits your house.
Prefer to talk? +41 78 830 83 35
Photovoltaics Switzerland – installation by a specialist company →
Swissolar-certified specialist company · ESTI installation authorisation (Art. 14 NIV) · in Zurich since 2017 · over 150 systems completed · a personal answer from the specialist company, no call centre
Sources: General technical basics on PVT technology (photovoltaic-thermal), solar thermal and heat pump sources; empirical data from ecoEn GmbH's planning practice, Zurich region.
Last updated: 9 July 2026 · Author: ecoEn editorial team
