Central Heating

Advice on installing a bypass valve on central heating flow/return.

Anonymous user 28/02/2024 - 3.32 PM

In a week or two, I would like a heating engineer to make some changes to our domestic central heating system. However, I don't even know if these changes are possible or permissible. Our system consists of a Worcester 24i Junior (2006 model) combi boiler and 5 radiators (4 with TRV's and 1 left permanently open.) We'd like to install the Honeywell EvoHome smart heating system, which allows every radiator to operate as an individual zone and 'call for heat' from the boiler separately. The radiator in the hallway, doesn't have a TRV, which I think is to allow it to act as a bypass and provide the minimum flow required for the boiler's CH circuit. However, I have also heard that an automatic bypass valve, if fitted between the CH flow and return, can provide the minimum flow required to the boiler (which, according to Worcester, is something like 2 litres/minute, but I'd need to double check!) The problem with having the hall radiator 'constantly open' is that it does serve a purpose if the hall has a wall mounted thermostat fitted. However, if you are zoning each individual room to 'call for heat' from the boiler, then having a radiator 'open constantly' means that no matter which room calls for heat, the hall radiator will always warm up. Is it possible for an engineer to install an automatic bypass valve between the flow and return beneath the boiler, and install a smart heating TRV to the hall radiator? Thanks for your help!