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Must be something about Valentine's day. Our Ecotech Plus 837 has just developed a fault. The 'stat is demanding heat, the boiler is kicking-in, pump circulating and I feel heat at the very start of the flow pipe. I can also see the zone valve opening. The flame symbol comes on for about...

I'm looking to replace my old, traditional boiler with a completely new system. I've narrowed it down to the following.. Unvented system (Mega flo, Titan Flomaster) with a system boiler or Thermal store (Gledhill Boilermate) with a system boiler I'm being blinded by facts, figures etc...