Our house has a poor performing central heating system.
There is enough heat input from the boiler (30kw).
But it's an old house with four individual circuits including the HW.
The system has a 6m pump feeding the 4 motorised valves.
Trouble is when 2 or more zones are calling some of the more remote rads don't get any feed.
Can I fit another domestic pump to another part of the sytem or does it need a light/commercial pump in?
You need someone to come out to see the installation. You could go for a larger industrial sized pump or a second pump - but it's a really old boiler/system the extra pressure the system will be under could cause more problems than it'll solve.
The best way for initial installation would have been to have one pump per floor/zone. That way each pump will only feed 14 radiators, and if one pump packs up - the rest of the system will still work.
Although this might prove expensive as it's alot more electrical work and pipework as you don't want pumps pumping against each other.
You would also need to leave one zone open as a fail-safe so if the boiler stat failed all zones wouldn't shut down together. This way excess heat can escape via the radiators.
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