Sterno does not get hot enough to boil water so you cannot boil any water with Sterno.
You might be able to boil just a tiny bit of water using Sterno or at least get the tiny bit of water hot enough but you won't be able to boil a pot of coffee or water with the Sterno cooking fuel.
Sterno is a great product though and great to have around and it can heat up some water but it will not boil water.
For example you could heat up some water with Sterno and then make instant coffee or tea with it but it won't boil water to make foods such as noodles.
Sterno Cooking fuel does burn clean.
Sterno cooking fuel is made from ingredients and a formula that is biodegradable and water soluble which makes the Sterno cooking fuel clean burning.
Sterno cooking fuel also does not emit any carbon monoxide or hazardous fumes into the air so the Sterno cooking fuel is safe to use indoors and inside a tent, camper, house etc.
I have used Sterno camping fuel to cook food inside a tent before when camping and have also used Sterno cooking fuel in my house during a power outage when my electric stove could not operate.
I never had any bad smells to the Sterno cooking fuel when it was burning and it did burn really clean.
Sterno cooking fuel is a wonderful thing to have around for both camping and to have as an emergency cooking source during power outages.