I'm curious about this. I read that they can be linked to a radiator/central heating system, but there's some suggestion that the radiators you already have installed may not be the best fit, efficiency-wise. Be good to learn more.
I read this article recently which was quite interesting. Seems like you can use your existing radiators but they generally run less hot. I guess it’s a “slow and steady” approach.
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https://tomkiss.net/life/going_fossil_free_in_a_terraced_victorian_house