Least number of radiators required on a combi circuit?

[TerryWaite]

Hi

I have a customer who wants a gas fired medway water heater taking out which is serving a couple of bathrooms, but the customer wants a combi boiler installing in its place. He wanted the combi boiler to just do the hot water for now, but wants some radiators connecting to it in the future, and suggested I just blanked the heating connections on the boiler. I told him unfortunately that would not be possible, doesnt work like that, and he would need at least one radiator conecting.

I would prefer to connect the boiler to more than one radiator as im sure this will burn the boiler out quicker and not get rid of enough heat before returning back to the boiler, the customer doesnt even want one rad, suggesting i just loop the flow and return a metre or so away from the boiler and go straight back in.

What are the minimum requirements here?

thanks

John

 

[GrahamM]

Never done it, but have it on good authority it used to be cheaper to buy cheap combi and loop flow/return than buying a water heater.

 

[GQuigley67]

i dont know personally never done it, manufacturer would know best i suppose

 

[Mike Jackson]

I think you can use an intergas combi without rads. Other than that 1 rad would do the trick.

 

[hammers4spanner]

Ive done it on numerous occasions f/r linked under floor and works a treat, done it because of longer warranty on boiler than water heater

 

[EPH]

I'd assume as long as you put the minimum amount of pipe work that you can fit an auto by pass on it would be fine.

Think it's 3m?

 

[mountainman]

I've done it with just a loop of 22mm under the boiler.

 

[rsr]

Intergas combis can be run on the hot water circuit only with no need to have any heating pipes connected. I've commissioned hot water for customers without any heating circuit set up. Good boilers and great hot water delivery.

Cheers

rsr

 

[AWheating]

id fit one rad on it, when winter comes and the customer likes the heat off it you will get the call to come and add a few more rads

 

[arran197]

Just add one in with lock shields. As long as there is somewhere for the heat to go just in case they put the heating on.

 

[ambrosia]

seen it done where it didnt even have a loop, they had just capped off flow and return under the boiler, customer said it had been in 5 years without a problem, supprised me to see it, surely putting in a multipoint would have been cheaper and less prone to problems

 

[ecowarm]

As above Intergas combi, designed to run with no heating pipes. Just program it to run as a multipoint, and later when radiators fitted reprogram to run as combi.