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Heat-Retaining Fireplace and Water Circulation in a Compact Urban Home

Authors:
Martin Kovařík, Nikol Čapková, Martin Coufal
Heat-Retaining Fireplace and Water Circulation in a Compact Urban Home
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Incorporating a heat-retaining fireplace and innovative water circulation systems, the compact dwelling maximizes space efficiency and sustainability for urban living.
5 key facts about this project
01
The design includes a 5.1 m² terrace module for outdoor living.
02
The project utilizes a heat-retaining fireplace for improved energy efficiency.
03
An incineration toilet reduces water consumption significantly.
04
Gray water and rainwater systems enhance sustainable resource management.
05
Each module is carefully sized for multifunctional urban living.

The MICROHOME 2020 project presents an innovative approach to urban housing through its independent tunnel house design. Spanning a compact 25m², it prioritizes functionality and sustainability. The layout is specifically crafted to meet the demands of modern living while maintaining a focus on efficient use of space.

Modular System Design
The design includes three main modules: a living/working unit, a hygiene unit, and a sleeping unit. The living/working unit, at 7.3 m², is designed for flexibility, accommodating both work and personal activities. The hygiene unit, measuring 4.8 m², provides essential facilities, ensuring comfort and convenience. The sleeping unit, also 7.3 m², underscores the need for adequate sleeping space within a compact environment.

Additionally, the project features a terrace module of 5.1 m² that enhances the livability of the home by providing outdoor space for relaxation and socializing. This integration of an outdoor area allows residents to enjoy nature and engage in open-air activities, improving their overall living experience.

Sustainability Initiatives
A strong focus on sustainability drives this design. Various features work together to minimize waste and enhance energy efficiency. A heat-retaining fireplace contributes to thermal efficiency, while an incineration toilet reduces water usage. The incorporation of gray water and rainwater circulation systems supports responsible management of water resources. Furthermore, solar thermal collectors and solar transparent panels aim to capitalize on renewable energy, reflecting contemporary environmental concerns in housing design.

Material Use
The selection of materials for the MICROHOME 2020 includes wood, metal, glass, and foam. Each choice is made for its durability and potential to create a sustainable living space. This combination of materials not only ensures structural integrity but also contributes to a modern aesthetic, making the home both functional and visually appealing.

The thoughtful arrangement of these elements creates a cohesive living environment that emphasizes practicality and efficiency, addressing the essential needs of urban residents while showcasing an intelligent solution to compact living.

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The Next House: USA — A Global Call to Reimagine the American Suburb

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Competition organisers

Buildner is launching The Next House: USA, a global architecture competition that challenges architects, designers, and thinkers to reimagine the American suburban home for the 21st century. For decades, the suburban house has symbolized comfort and stability, but today it often reflects excess, isolation, and environmental strain. This competition asks: how can the American home evolve to address climate urgency, economic pressures, and shifting social values?

Participants are tasked with designing a prototype home of no more than 1,500 sq ft (≈140 m²) for a household of two adults and one child. The design should be compact yet generous, adaptable, sustainable, affordable, and replicable across diverse U.S. contexts. More than a design exercise, the competition aims to spark a conversation about how homes can support healthier, smarter, and more connected communities.

The total prize fund is $20,000 USD. The final registration deadline is May 20, 2026, and winners will be announced on September 22, 2026. The Next House: USA invites architects, students, and visionaries worldwide to redefine what the American home means today—and what it should mean tomorrow.

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