Can you use a combi as a conventional boiler?

[M&W]

Hello all. Im new to the forum and what im wondering is. Can you use a combi boiler as a conventional boiler?

 

[stevetheplumber]

depends what you mean by conventional some you can use as a sytem boiler

 

[M&W]

Its a oil fired grant floor standing. non condensing combi boiler. The customer wants to start a B&B but doesn't have the money to convert the system from combi to unvented due to the fact she would have to buy a new cylinder and new boiler. I was just wondering if you could convert it. I thought if i capped the hot and switched it of at the boiler/programmer. Could you then use the heating flow and return as a primary flow and return?

 

[Puddle]

For clarification ,are you saying you do not want to use the instant hot water side of the boiler,just the flow and return for heating and cylinder supplied hot water ?

 

[M&W]

All I want the boiler for is the flow and return. These would then go to the cylinder via, auto bypass, two two port valves, one for heating one for hot water pressurised cylinder la la la. Do you get what I mean.

 

[Puddle]

All I want the boiler for is the flow and return. These would then go to the cylinder via, auto bypass, two two port valves, one for heating one for hot water pressurised cylinder la la la. Do you get what I mean.

Yes I do now and there is no reason why not to do as you say,splitting heating circuit into heating and hot water circuits

You could also consider maybe just using the instant hot water side to supply kitchen or laundry room,if hot water draw off from cylinder far away
🙂

 

[emerald]

dont think you can cap off the hot, pretty sure you need at least one outlet, due to the expansion in the pipework, mind you it was ten years ago when i was at college, so i maybe wrong😕

 

[stevetheplumber]

depends what you mean by conventional some you can use as a sytem boiler

yes you can do that just dont connect the main or as said use it for one or two drawofs
just be carefull how you wire it you will need to run switch lines from combi through the aux switches on motorised valves as its possible to wire out certain safety features on the combi which work by cutting the feed to the line out