How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Airheatman Your Own Question
Airheatman
Airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 8253
Experience:  Furnace, A/C and heat pump specialist.
16514686
Type Your HVAC Question Here...
Airheatman is online now

I have water above and around the header tank in the loft,

Customer Question

i have water above and around the header tank in the loft, the property is left employ with the heating on and there has been sufficient water to stain the ceiling below. i have checked the roof and there is no obvious leak. the water in the header tank is warm. could the heating cause a sudden "blow back of hot water through the header tank or vent pipe which might cause this water? if so, what might cause it and is it something that needs a repair or perhaps a "one off" due to the property being un occupied?
Submitted: 1 year ago.
Category: HVAC
Expert:  Airheatman replied 1 year ago.
If unit has been off you should have a maintenance performed on the boiler before using. It is possible the water came from the overflow or vent as water was heated and expanded.Boilers should really be inspected annually though to make sure they are operating safely . The tank should have a bleed valve to prevent the relief valve from blowing of water, but this should be done by a professional.
Customer: replied 1 year ago.
THE HEATER HAS NOT BEEN OFF, BUT RUNNING ON LOW TO KEEP THE PROPERTY FROM DAMAGE DUE TO COLD WEATHER ETC. IF THE "BLOW BACK OCCURRED, WHAT MAY BE THE CAUSE OF THIS AND IS IT AN ISOLATED INCIDENT?. I AM LOOKING TO HAVE THE SERVICE CARRIED OUT, BUT DONT WANT TO REPAINT THE CEILING JUST INCASE IT HAPPENS AGAIN.
Expert:  Airheatman replied 1 year ago.
Were there any tale tale signs of the source such as a sudden once burst of water or drip from a fitting or valve? Also any condensation on any horizontal piping? I have often see a no insulated pipe sweat and drip on ceiling.
Expert:  Airheatman replied 1 year ago.
I would , like you, wait until it has been serviced before repainting just to make sure.If there is an air pocket it could burp as that pocket enters the tank and discharge water again.
Customer: replied 1 year ago.
AN AREA ABOVE AND AROUND THE HEADER TANK APPROX. 4FT DIAMETER IS WET, LOOTS LIKE THE PATTEN YOU MIGHT GET IF STEAM WAS VENTING FROM THE OVERFLOW PIPE. NO WATER ON THE PIPE, NOT SURE HOW LONG AGO IT HAPPENED, I WAS ASKED TO TAKE A LOOK FOR THE LADY WHILST SHE IS IN HOSPITAL. THOUGHT INITIALLY THE ROOF WAS LEAKING, BUT LOOKS OK AND THE WATER IS ON THE UNDERSIDE OF THE FELT AND DRIPPING ONTO THE INSULATION AND THROUGH THE FLOOR, SO A FAIRLY LARGE AMOUNT OF WATER. THE WATER STAIN ON THE CEILING IS BROWN AND THE ROOF FELT IS DAMP AND DRIPS WHEN TOUCHED.
Expert:  Airheatman replied 1 year ago.
Was looking for this video to share with you.Hopefully may provide some more insight about why it needs to be bled.https://www.youtube.com/watch?v=YpLJYCMCgGk
Customer: replied 1 year ago.
It's a vented system, the video suggests its unvented, if so not relevant.
Expert:  Airheatman replied 1 year ago.
Yours is vented,The video is just an idea of how the tank fills with air and water causing the purge.
Customer: replied 1 year ago.
Ok, thanks
Expert:  Airheatman replied 1 year ago.
No problem,Hope you the best with getting this serviced and issue solved.

Related HVAC Questions