I have a 400kpa geyser/boiler on the ground floor of a double story home supplying hot water to the upper floor as well. It constantly leaks water. It is a Gap 400kpa horizontal geyser that was installed horizontally... all pipes appear to be correct.

My apologies: edited to say "installed vertically"I have a 400kpa geyser/boiler on the ground floor of a double story home supplying hot water to the upper floor as well. It constantly leaks water. It is a Gap 400kpa horizontal geyser that was installed VERTICALLY... all pipes appear to be correct.