Individual and community health issues aside, boiling water over wood or charcoal stoves has enormous consequences for the planet’s climate.
The use of wood or charcoal contributes to climate change by producing high levels of greenhouse gases. Further, it destroys forests, resulting in more rapid rainfall runoff and water scarcity.
Even if you could somehow use a stove to power the waterbox, the energy efficiency of the germicidal flourescent light in the waterbox would only produce 0.06% of greenhouse gases compared to boiling over charcoal or wood.