to conserve fuel
The same reason it is a suitable job for boys.
they have a space shuttle for a reason
It's called water heater. There isn't a reason to heat hot water
For the same reason we construct houses. For shelter. Hope this helped you. :)
It can kill them, their nests, their young, their food, their shelter, and a reason to not live.
Since they run in parallel, there's no way that a heater core will cause a radiator to get hot.
The most common reason the heater is blows cold air on a 1999 Ford Winstar is a bad thermostat or blocked heater core.
The metal grille on top a heater has a few purposes. One reason is safety, to prevent you from touching the heater directly. Another purpose is that the grille acts as a shield to prevent things from burning or melting around the heater.
This question is very vague, however, is the gradient of the laminated shelter correct? If the gradient is not right, this would be the reason for the stagnant water.
It depends on the local climate, and exactly what you mean by "shelter". In some climates, there's no real reason you shouldn't be able to survive indefinitely without shelter.
The tree would provide shelter for birdsn
No one but you can decide. The whole reason for a water bed heater is to make the people sleeping on the bed comfortable. For that reason, the temperature should be raised or lowered according to your comfort.