from bbu to a combi

[desrob]

whats the easiest way to do this,i can't find were central heating system is t'd in, it's old, no boiler interlock gravity primaries,indirect cylinder.am i to rip the house to bits.

 

[unguided1]

No you dont need to rip the house to bits i assume the DHW is in an airing cupboard and you will rip it out, with the DHW gone this will have no warmth in it so put a radiator in there and it can still be used as an airing cupboard and you no longer have to worry about tracing the pipework.

 

[plumber0808]

you would normaly find them tee'd into the primarys inside the boxing running up the side of the chimney breast where you will also find the pump.
if not then the bbu will have another two tappings feeding the heating, again the pump maybe inside the boxing, if not then you can bet on the pump being positioned under the floor boards close to the bbu.
if you pull back the carpet you will probably find a trap

 

[stevetheplumber]

whats the easiest way to do this,i can't find were central heating system is t'd in, it's old, no boiler interlock gravity primaries,indirect cylinder.am i to rip the house to bits.

easiest way is to put the combi where the cylinder was then run the heating where the primaries were ive even seen the inch cut top and bottom with 22 pushed through it
remember most bbus are on system at least 15 years old many over 30 so flush flush flush and new valves

 

[desrob]

you would normaly find them tee'd into the primarys inside the boxing running up the side of the chimney breast where you will also find the pump.
if not then the bbu will have another two tappings feeding the heating, again the pump maybe inside the boxing, if not then you can bet on the pump being positioned under the floor boards close to the bbu.
if you pull back the carpet you will probably find a trap

yes pump bi side of chimney breast, but in 15mm,if i put combi i airing cuboard were cylinder was whats the eaiest way to do the heating side ,still not sure if the heating is off primarys or bbu tappings

 

[plumber0808]

if your putting the boiler in the a/c the easiest way would be to connect the new boiler heating pipework onto the primarys and then connecting the primarys onto the heating circuit above the bbu (being the floor above)
not the best option if your going to fit a combi as you will be applying a lot more pressure through old 28mm pipework

 

[tackleburger]

This post is mystifying me. I mean Desrob have you never done this before? I can't believe that you are taking on the job if you haven't done this kind of work before. BBU change outs are straight forward although they can be time consuming. It is the same as any other change out where an open flue with gravity pipework is concerned.

I assume you are at the survey stage and haven'tr actually started making an pigs ear of the job yet.

 

[tackleburger]

whats the easiest way to do this,i can't find were central heating system is t'd in, it's old, no boiler interlock gravity primaries,indirect cylinder.am i to rip the house to bits.

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