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  1. J

    Boiler Thermostats

    No response to my previous posting so perhaps a simple question may provoke an answer :?: Does the boiler thermostat control the temperature of the Flow or Return water? Thanks in anticipation that someone out there knows the answer.
  2. J

    Water boiling in the heating system

    I have a Glow-worm fuelsaver F boiler, Myson Aerjec auto-venting thingy and a Honeywell MPV which is stuck in the mid-position. There is also a manual bypass valve. With the boiler stat set on 2 (out of 6) and with the bypass valve almost shut the water boils up through the Aerjec vent. With...
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