Yes, old cast iron radiators with large diameter plumbing, holds 250-300 liters of water total. As opposed to most other systems of this type, our radiators are quite large, I'd guess at least 20% larger than what I've seen in other houses. Lucky for us we can keep the supply temperature down.
Normal temperature for this type of system is 60/40°C supply/return, I've been able to keep supply below 50°C (40° when it's above freezing outside). Return temps can be only 5°C below supply if the boiler has been work in lowest setting for 1.5-2 hours, but I'm still getting condensate.
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Ecorenovation - the bottomless piggy bank that tries to tame the energy hog.
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