Boiler Leaks Only After No Heat

Hi. I hope someone can give me a clue what might be going on.
I have a new Burnham ES25 gas hot water boiler with indirect hot water. I have 3 zones for heat plus a 4th zone for indirect hot water. It's a 16500 0 BTU boiler. It was installed last November.
Here's my problem. It seems that after not providing heat for a while, if I ask it for heat, it leaks from somewhere under the boiler. It happened t wice. Once after I had a problem with the boiler and had no heat for a day (the connector for the flu damper was loose so the boiler wouldn't fire up ). And once in the Spring when I thought heating season was over and we ha d a cold night, so I turned the heat zones back on. Both times, after I tu rned the heat back on, I noticed a small puddle on the floor near the left front corner of the unit. There was also water underneath, it seems on the left side. But since the right side is near the wall, I couldn't really s ee if there was water under that side also.
If it was a leak, I would have leaking all the time. The boiler runs 24/7, even during the summer for hot water, and I never see water at all. When it was running constantly all winter, I never saw any water. Just those two times.
What could cause this?
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Hi. I hope someone can give me a clue what might be going on.
I have a new Burnham ES25 gas hot water boiler with indirect hot water. I have 3 zones for heat plus a 4th zone for indirect hot water. It's a 16500 0 BTU boiler. It was installed last November.
Here's my problem. It seems that after not providing heat for a while, if I ask it for heat, it leaks from somewhere under the boiler. It happened t wice. Once after I had a problem with the boiler and had no heat for a day (the connector for the flu damper was loose so the boiler wouldn't fire up ). And once in the Spring when I thought heating season was over and we ha d a cold night, so I turned the heat zones back on. Both times, after I tu rned the heat back on, I noticed a small puddle on the floor near the left front corner of the unit. There was also water underneath, it seems on the left side. But since the right side is near the wall, I couldn't really s ee if there was water under that side also.
If it was a leak, I would have leaking all the time. The boiler runs 24/7, even during the summer for hot water, and I never see water at all. When it was running constantly all winter, I never saw any water. Just those two times.
What could cause this?
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Hi. I hope someone can give me a clue what might be going on.
I have a new Burnham ES25 gas hot water boiler with indirect hot water. I have 3 zones for heat plus a 4th zone for indirect hot water. It's a 165000 BTU boiler. It was installed last November.
Here's my problem. It seems that after not providing heat for a while, if I ask it for heat, it leaks from somewhere under the boiler. It happened twice. Once after I had a problem with the boiler and had no heat for a day (the connector for the flu damper was loose so the boiler wouldn't fire up). And once in the Spring when I thought heating season was over and we had a cold night, so I turned the heat zones back on. Both times, after I turned the heat back on, I noticed a small puddle on the floor near the left front corner of the unit. There was also water underneath, it seems on the left side. But since the right side is near the wall, I couldn't really see if there was water under that side also.
If it was a leak, I would have leaking all the time. The boiler runs 24/7, even during the summer for hot water, and I never see water at all. When it was running constantly all winter, I never saw any water. Just those two times.
What could cause this?
Check your high pressure relief valve, perhaps your pressure goes up near valve limit?
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Site Timeline

HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.