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i have a heat line vizo 24 combi boiler. it gives out heating

Resolved Question:

i have a heat line vizo 24 combi boiler. it gives out heating but the hot water does not run for long. it runs hot for a 30 secs then runs cold and then runs not as hot up and down. what is wrong
Submitted: 7 years ago.
Category: HVAC
Expert:  Unavailable replied 7 years ago.
Hello, without seeing your application I don't have a good answer, However you may be using more hot water than the unit can supply. Some combo boilers use a insulated storage tank and a small temperature controlled circulator pump, along side the boiler for domestic hot water. A arrangement like this can help with a heavy load condition. More information regarding your set up would be helpful. Thanks.
Unavailable and 3 other HVAC Specialists are ready to help you
Customer: replied 7 years ago.

thanks for replying. we only get two or three pints of hot water at a time before it goes cold,

 

Expert:  Unavailable replied 7 years ago.
Wow, was the unit working fine before? or is this a new condition?
Customer: replied 7 years ago.

its been working ok for 2 years .been like it for about week

Expert:  Unavailable replied 7 years ago.
It could be that an increased heating load due to cold weather (if you are now having cold weather) is causing the problem you describe. If so the problem may resolve its self once the extra heating load on the heating system goes down. However there could be other problems in the piping, heat output of the boiler, boiler water temperature, system heating water temperature, domestic water circulating pumps (if any) as well several other factors. I would look to see if anything has changed, weather for example, as a starting point. It seems clear to me something has changed.

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