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whats the best additive for circulation problems

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Gary80gas

Gas Engineer
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Ive got a heating system boiler where even with the pump running continuously it occassionally takes opening the hot water circuit to get the heating hot. This somehow overcomes resistance to flow.
Theres some air(gas) I can hear circulating that wont vent anywhere.
What would be the best additive to clear air(gas) and also aid the circulation?
Im looking for low budget solution. Thanks.
 
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