It does exactly what you need it to do - make hot water.

I also use it to boil water in a small Japanese cast iron teapot

This heater takes a long time to bring the water to boil

I gave up my microwave and replaced it with this device to warm my water, soup amd and coffe

If buying hot water is a good choice

I needed a heater to warm up the water in my aquarium to 120F to kill black beard algae that has taken over the fish tank

Makes more hot water fast

This is fairly quick to boil cold water.

Since I do not have a water heater, I use this to heat water for bathing in the van during winter months, when a solar shower does not work

I boiled water in a hotel room for a trip for instant cup meals and it brought it to a rapid boil in a few minutes

Other than that, it's a nice and compact way for me to boil water when I'm traveling

They only served decaf coffee, so I purchased this item to boil water for instant coffee

I needed a heater to warm up the water in my aquarium to 120F to kill black beard algae that has taken over the fish tank

The water maintains a rolling boil once the water boils.

I will be re-heating clean, but cool Dishwashing water

1-2 quarts of hot to boiling water in sauce pan 15 minutes.

I need a low power solution, since I'm using this on an off-grid solar system and I got the time to wait, but I can't afford to burn up power at 3x+ the rate for other options (like coffee pot or microwave over, or induction burner for a single cup of hot water).

I use it for travel and wish that it had a holder to set it on after taking it out of the hot water

If it's completely covered by water, you can even boil water in a polypropylene (#5 plastic) because the water removes the heat before it gets hot enough to melt the plastic, which is convenient if you're trying to travel light.

I got a cup of bubbling hot water in less than 5 mins

I've only used a few times so far but works great! heats up water quickly and seens to be solidly built.