The 32 year old one is a Potterton Netaheat 6/10. The gas man said "some parts NLA, but don't replace it unless you absolutely have to..."
One of my customers has a Baxi number 2 the second model baxi ever made ,I offered it to Baxi for there museum in exchange for a new system and they would of taken it if they didn't already have that model.The burner is about 450 mm square and has 4 pilots ,the house is filled with big steel pipework
