Least number of radiators required on a combi circuit?

[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.