wrote in message
oups.com...
So with all this talk of cheap boilers, what make of boilers have a one
piece heat exchanger?

Ideal: Icos, Istar
Keston: all
Viessmann: all
Worcester-Bosch Greenstar and others
Eco-Hometec
Quantum
Gledhill
Potterton Promax (spit)
Nearly all the expensive top makes.