What sustainable temp do I need for flatwork?

The Hydro Tek SC high volume machines have a 120° rise, so with 60° inlet water temp, you can get 180° operating temp. However, with their adjustable flow capability, if you need more heat for a specific purpose, you can reduce the flow a little, and get up to 200°.
 
Russ, why is it that most brands only have a 120 degree heat rise but a few others say their machines will do the 140 degree heat rise?

Is it a 3/4" coil?

Bigger burner/flame?

Just wondering why some will get a lot hotter than others out there.

Thanks Russ.
 
Mostly it's the size of the coil in linear feet of pipe. I'd love to see manufacturers using 20", 6 pancake coils on anything over 5 gpm. The water would have so much more time in the fire, and would reduce the fuel needed to heat the water to the same temperature. Of course, they'd have to re-engineer the frames for the 20", and the machines would initially be more expensive, but the fuel savings would make up the difference over time.
 
Thanks Russ.
 
Heat rise will still only get SO hot. If you've got 40° water coming in, and have a 120° rise, you can turn the thermostat to 200°, but you'll never get over 160°. Conversely, if the incoming water is 90°, and the heat rise is 120°, the thermostat will stop it at 200°.
 
Russ Johnson said:
Heat rise will still only get SO hot. If you've got 40° water coming in, and have a 120° rise, you can turn the thermostat to 200°, but you'll never get over 160°. Conversely, if the incoming water is 90°, and the heat rise is 120°, the thermostat will stop it at 200°.
Click to expand...

Ah ha! I wonder what my heat rise is???
 
Russ, for a machine that is 8gpm, what is a good length of coil to use that is 1/2" ?

Thanks.
 
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