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Answered in 37 minutes by:
12/10/2014
Marc, Plumber
Category: UK Plumbing
Satisfied Customers: 1,595
Experience: Plumbing and Heating expert with 25+ years experience, 21+yrs self employed as a contractor.
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From the information you are giving, I can see that your system is overloaded. There are too many radiators and towel rails on the system with only 22mm pipework. Now, not knowing the BTUs of the 20 radiators that you have it is difficult to be 100% correct as to what size piping you should be using for the main pipework, however, it is my recommendation to increase the mains to a 32mm pipe.
This may prove to be slightly costly to perform, however, 22mm piping can only transfer around 80,000btus of heat. It appears the demands of the radiators are significantly higher than this.
From the information you are giving, I can see that your system is overloaded. There are too many radiators and towel rails on the system with only 22mm pipework. Now, not knowing the BTUs of the 20 radiators that you have it is difficult to be 100% correct as to what size piping you should be using for the main pipework, however, it is my recommendation to increase the mains to a 32mm pipe.
This may prove to be slightly costly to perform, however, 22mm piping can only transfer around 80,000btus of heat. It appears the demands of the radiators are significantly higher than this.
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