Recent content by petegj

About the knowledge, sadly not the time! Can you help and explain thermal shock to me. I would have thought that low firing rate with a low flow rate is equivalent in terms of temperature rise to high gas rate with a high flow rate. Why would this cause damage to the heat exchanger?

Hi ScottishGasMan, Thanks for your help. I'm surprised that the unit doesn't just shut down when there's a risk of thermal shock. Anyway, I've increased the pump speed to medium and lowered the temperature to 65. I'm now getting 65 out and 51 return. Still looks like it has modulated to it's...

Wasn't planning on having it serviced for at least a year

Is this OK or am I doing damage to my boiler somehow? The set up is: British gas 330+ (min flow rate of 600l/ph quoted for 10kW lowest modulation) Grundfos 15-60 130 super selectric pump (on lowest setting, max 2.2 metres head) Flow temperature - 71c Return flow - 50c 8 radiators 3 bed...