Why japan and US have more solar heated home than any other country?

Japan and the United States have more solar-heated homes than many other countries due to a combination of favorable government policies, technological innovation, and public awareness of renewable energy benefits. In Japan, supportive incentives and initiatives post-Fukushima have accelerated the adoption of solar energy, while the U.S. has seen a surge in residential solar installations driven by tax credits and decreasing technology costs. Both countries also benefit from a strong culture of environmental sustainability and energy independence, further promoting the use of solar heating systems.