In article ,
"John Stumbles" ] writes:
"Andrew Gabriel" wrote in message
...
... You will likely need to add some
thermostatic radiator valves to conform to building regs when boiler
is changed.

AIUI (from the last time I ploughed through Part L looking for this) you
don't have to have TRVs as long as the system is controlled by a room 'stat.

That's correct, but most people have many more rooms than they
do room stats.

--
Andrew Gabriel