A passive house is designed to minimize its heating requirements by taking advantage of thermal insulation, air tightness and solar orientation. However, although these homes are extremely well insulated and consume little energy, a heating system is still required for periods of extreme cold or to compensate for unavoidable heat loss. In this article, we explore how to integrate a heating system into a passive house in an efficient manner, in line with the principles of low energy consumption.
Passive house principles
Before looking at heating solutions, it’s essential to understand the principles of the passive house. This type of construction is designed to offer maximum thermal comfort without relying on large amounts of energy. Passive house design is based on several key elements:
- Excellent thermal insulation: walls, windows and roofs are reinforced with energy-efficient materials to reduce heat loss.
- Perfect airtightness: the passive house prevents cold air from entering and warm air from escaping.
- Controlled mechanical ventilation (CMV): a ventilation system maintains optimum air quality while recovering heat from the outgoing air to preheat the incoming air.
Together, these elements considerably reduce heating requirements. However, a heating system is still necessary to maintain a comfortable temperature in the event of very cold outside temperatures.
Heating options for a passive house
Underfloor heating
Underfloor heating is an ideal solution for a passive house, as it operates at a low temperature, which is perfectly suited to the needs of a low-energy house. This system uses pipes embedded in the floor to distribute gentle, even heat throughout the room. It can be powered by a heat pump, a solar thermal system or even a condensing boiler.
Underfloor heating is often preferred in passive houses, as it maximizes the use of heat produced by other systems (such as a heat pump or condensing boiler) while guaranteeing optimum comfort.
Heat pumps
Heat pumps are one of the most common solutions for heating passive houses. They capture thermal energy from the air, water or ground and redistribute it in the form of heat throughout the house. A geothermal or air-to-water heat pump can be used to heat a passive house, while remaining highly efficient in terms of energy consumption.
One of the great advantages of heat pumps is their ability to also produce domestic hot water, which can meet all the heating and hot water needs of a passive house.
Low-temperature heaters
Low-temperature heaters, such as inertia radiators or radiant panels, are also suitable for passive houses. These devices operate efficiently at lower heating temperatures, which is consistent with the Passive House approach. Inertia radiators, for example, store heat and release it gradually, enabling a stable temperature to be maintained in the home without excessive energy consumption.
Solar heating
Solar heating is a particularly appropriate solution for a passive house, making the most of the sun’s energy. By installing thermal solar panels on the roof, you can capture the sun’s heat to heat water or even power an air or water heating system. Solar heating can be combined with other systems, such as a heat pump, to provide additional heating in winter, when the sun’s rays are less intense.
Ventilation with heat recovery
Although not strictly speaking a heating system, ventilation with heat recovery (VMC double flux) plays a key role in a passive house. This system extracts stale air from the house and recovers heat before it is exhausted. The incoming fresh air is thus preheated, enabling a comfortable temperature to be maintained without the need for conventional heating systems.
Optimizing energy efficiency
In a passive house, the aim is to reduce energy consumption as much as possible. To achieve this, it’s essential to properly size the heating system, insulate all parts of the house and install energy-efficient windows. Energy management must be optimized with intelligent control devices, such as connected thermostats and room-by-room temperature controls.
It’s also important to ensure that the heating system you choose is compatible with Passive House principles. For example, a heating system that operates at high temperatures (such as a traditional radiator) would be inefficient in a passive house, as it would waste energy and be unsuited to the high-performance insulation of this type of home.
Conclusion
Integrating a heating system into a passive house requires a thoughtful approach and a careful selection of technologies that will respect the principles of energy efficiency and low consumption. The most appropriate solutions, such as heat pumps, underfloor heating or solar systems, can meet thermal comfort needs while optimizing energy use. If you’re planning to install or renovate a heating system in a passive house, it’s essential to understand the specifics of your home in order to choose the most appropriate system.
For more advice on installing heating in a passive house, or to find out more about our heating solutions, please contact us via our contact page.
