Hi the 100 range on combi /system is okish rubber hoses attract and hold iron oxide rust,pcb r not reliable and can be noisy on fire up.the budget 050 boiler has fog horn noise on start up and issues with divertor,the heat onlys are difficult to get air out main hex,the 200 range are hit and miss with pcbs not doing there job,not sure what service is like but not been to positive when speaking to other engineers
Apart from that all ok,I used to fit/maintain them,but now get involved on other brands