aquastat setting

Sunny from CT

Be watchfull of not setting your aquastat below 135 derees, because during your off cycles you may have the tendency to condensate the fire side of the boiler and start to cause sulfuric acid to build up from the soot. This will in turn start to eat away your boiler

Tom_42

aquastat setting

I have a one pipe steam system with a tankless coil. What is the optimal tempature setting for the aquastat? Obviously when the system is steam our hot water is extremely hot. And when it's not it's at the setting of the aquastat, right? Would there be any negative consequences if I lower the setting to say below 150 degrees? Of will that make it take longer to get up to steam on a call for heat?

Paul Fredricks_2

You can set it as low as you want, just as long as you still get enough hot water. And yes, it will take a little longer to get heat, but probably not much.

What you do need is a mixing valve to regulate the hot water temperature so that no one will get scalded. Not a huge expense, it's safer, and you get more consistant water temperatures.

soot_seeker_2

Most localities...

...and codes require that mixing valve. And I'd especially want one if I had older folks or children in the house. If it's a rental, it's a must to protect you from liability.

As you know, when that boiler is steaming, the hot water can give some nasty burns.

The mixing, or tempering valve, mixes cold water with the hot to moderate the temperature to a safe level. It also gives you more flow when the cold water is mixed with the feeble hot supply out of the coil.

Long Beach Ed