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Boiler on vacuum -outside of PED and GAD - which EN standards apply?

Boiler on vacuum -outside of PED and GAD - which EN standards apply?

Boiler on vacuum -outside of PED and GAD - which EN standards apply?

(OP)
Dear all,

We manufacture a naturally drafted steam "boiler" which operates on vacuum and below 120 C. Steam is used in a  closed loop to transfer energy to a heat exchanger, where the steam condenses and returns as water to be re-energized. Since we fall outside of PED (<0.5bar operating pressure) and we are outside of the Gas Appliance Directive (intended for industrial use), my question is which EN standards should we build to? our capacity is 175 - 350 Kw at the burner tip.

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