Steam Boiler Tankless

Wade_3

This may be a stupid or irrelevant questions to you pros, but here goes...

I have a steam boiler fitted with a tankess coil for DHW. My question is when the boiler is making steam, but there is no demand for DHW, what keeps the water inside the tankless (and in the pipes to and from it) from also boiling?

This morning I was in my cellar when the steamer was active and after it shut down I could hear gurgling and what sounded like boiling water in my piping coming out of the tankless. Those pipes are copper with sweated fittings. What keeps them from blowing apart?

Thanks

Al Letellier_9

water in tankless

It's a simple answer, Wade (when you know it). The coil is full of pressurized water, at city or pump pressure. The water in the boiler is at 0 or 1 lb of pressure. It takes a lot more heat to make that water at higher pressure to boil, and I doubt your home's boiler has the power to do it. But that is why we install pressure relief valves on boilers, water heaters and coils...just in case. As long as the water in the coil is under pressure, it will never boil. If the water is heated over 212* and then comes in contact with a lower pressure area, you will get steam.

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