Bob Heath’s net-zero home is well sealed and insulated and it gets 50 per cent of its heat from passive solar streaming through the windows. He needs only a small amount of heat that is provided by radiant electric heaters powered by solar modules.

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Bob Heath's net-zero home is well sealed and insulated and it gets 50 per cent of its heat from passive solar streaming through the windows. He needs only a small amount of heat that is provided by radiant electric heaters powered by solar modules. Photo David Dodge

Bob Heath’s net-zero home is well sealed and insulated and it gets 50 per cent of its heat from passive solar streaming through the windows. He needs only a small amount of heat that is provided by radiant electric heaters powered by solar modules. Photo David Dodge