Combi Boiler / Radiators Configuration?

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I know that a combi central heating system with TRV fitted radiators has to have at least one radiator with no TRV, thus ensuring a constant flow through the system. But does it matter which radiator?

My daughter has just moved into a 2 bedroom house (6 radiators) with a combi fitted in the downstairs kitchen. As she has a 3 week old baby, the heating is currently on 24/7 controlled by TRVs. Of the 6 radiators, 2 are not fitted with TRVs (Entrance Hallway and Bathroom Towel Rail). The enclosed entrance hallway gets very hot whilst the rest of the house (open plan) is 'comfortable'.

If I fit a TRV to the hallway (or switch it off), would the bathroom towel rail radiator provide sufficient 'flow capacity' for the combi? The towel rail is a 'ladder' type radiator (approx 500 x 800)
 
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It sounds like there is no room thermostat fitted. Fitting a room thermostat in the hall may be a better idea.
 
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Mikely, I am looking at a room thermostat as an option for the long term, but keen to know whether it is safe to switch off the hallway radiator as a short term measure. I am concerned that having the system on 24/7 during this cold spell will result in a hefty energy bill, and the excessivly warm entrance hall is providing no benefit to the living area of the house. DM
 
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It is perfectly safe to turn off the hallway radiator, it will not harm the system.
Regards
spraggo
 
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I think it may depend on the boiler type you have. Post the make/ model and someone should be able to tell you.

There you go - no need.
 
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The boiler is a Biasi M90F.24S. I will suggest to my daughter to switch off the hallway radiator. Thanks again both. DM
 

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