Thanks Anotherbgeng,
Im 90% sure that the problem is the scaled up heat exchanger. Your comments regarding scale protection, can this be done when I have the Heat exchanger Changed?
Regrads
Can you help me please? My hot water runs cold after a few minutes, then reheats only to run cold again, this keeps repeating itself.
1/ Could the Heat Exchanger be scaled up?
2/ Which Exchanger gas to water or water to water?
3/ Is this a costly job to fix?
Thanks