Hello all, first time poster, stumbled across this forum less than a week ago and have learnt a huge amount from browsing already – thanks.
I have a plan for my heating and HW setup; I’d appreciate the hive-mind’s thoughts on whether it will work or not.
Current set up: Worcester Bosch Greenstar condensing boiler feeding a typical S-plan with one zone valve for the radiators and another for the HW tank. All wired connections, other than an old RF thermostat/controller for the heating.
Proposed: Evohome controller running
• Same HW set up (not using a CS92 to cut equipment costs – I can always add it later).
• Isolate the existing radiator loop zone valve, mechanically set it open, leave it in situ.
• HR92s on all radiators.
• Fit new zone valve to a branch off the radiator loop, which will feed a single zone wet underfloor mixer/pump/manifold (so no manifold actuator required).
• BDR91 on UFH zone valve, bound to the main controller as thermostat.
• BDR91 on the boiler so that the HR92s and UFH can call for heat.
It is not normally good practice to fit UFH to the radiator loop, everything that I can find says to put in a dedicated zone valve and flow/return pipework. This makes sense if there is a single zone valve that allows flow to all radiators; you would not be able to have the UFH on unless all the radiators were on too.
I want to avoid this so that I don’t have to rip up bits of the house, which will save some labour cost (that I can spend on EH bits instead…). If I use HR92s to give every radiator its own zone valve, then it becomes feasible. If a radiator needs heat, it will call for it, fire the boiler and open itself. If the UFH needs heat, it will call for it, open its zone valve and start its pump. Concurrent activity should be possible.
Right?
Thanks in advance for your thoughts.
I have a plan for my heating and HW setup; I’d appreciate the hive-mind’s thoughts on whether it will work or not.
Current set up: Worcester Bosch Greenstar condensing boiler feeding a typical S-plan with one zone valve for the radiators and another for the HW tank. All wired connections, other than an old RF thermostat/controller for the heating.
Proposed: Evohome controller running
• Same HW set up (not using a CS92 to cut equipment costs – I can always add it later).
• Isolate the existing radiator loop zone valve, mechanically set it open, leave it in situ.
• HR92s on all radiators.
• Fit new zone valve to a branch off the radiator loop, which will feed a single zone wet underfloor mixer/pump/manifold (so no manifold actuator required).
• BDR91 on UFH zone valve, bound to the main controller as thermostat.
• BDR91 on the boiler so that the HR92s and UFH can call for heat.
It is not normally good practice to fit UFH to the radiator loop, everything that I can find says to put in a dedicated zone valve and flow/return pipework. This makes sense if there is a single zone valve that allows flow to all radiators; you would not be able to have the UFH on unless all the radiators were on too.
I want to avoid this so that I don’t have to rip up bits of the house, which will save some labour cost (that I can spend on EH bits instead…). If I use HR92s to give every radiator its own zone valve, then it becomes feasible. If a radiator needs heat, it will call for it, fire the boiler and open itself. If the UFH needs heat, it will call for it, open its zone valve and start its pump. Concurrent activity should be possible.
Right?
Thanks in advance for your thoughts.
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