Bastion 28mm Heatgaurd mixer is designed and suitable for water underfloor heating systems up to 14kw; Adjustable between 35°C - 65°C heating controls water valve thermostatic mixing valve; The valve comes with all 3 28mm compression connection on the inlet & outlet. 24 Feb 2014. #2. melias said: I have a speedfit underfloor heating system and I think my mixing valve is not working properly. Water from the boiler is hot, but it's luke-warm when going into the heating manifold and no turning of the knob on the mixing valve will change the temp. I've purchased a new valve and would like to change it myself.

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To fix it I need to turn the mixing valve up to 6, which suddenly releases flow through the manifold and loops. This causes the manifold return temperate to drop rapidly to about 20 degrees as the cold water in the loops flows through the system. I can then turn the valve back down to 4 and everything works fine.. The Manifold Control Pack provides temperature controlled mixed water to an underfloor heating system with a heat output up to 14kW. Installation and Maintenance Instructions. Thermomix®Underfloor Heating Control Pack. Reliance Worldwide Corporation (UK) Ltd Worcester Road, Evesham, Worcester, WR11 4RA, UK Tel: +44 (0)1386 712 400 Fax: +44 (0.