Does cast iron keep heat longer?

Yes. It heats more slowly but also cools more slowly, which is valuable where steady, gentle heat output is preferred.

Can cast iron be mounted on any wall?

No. The weight is serious, especially when filled. Reinforced brackets or floor supports may be required.

Sometimes, but most often it is chosen for style or inertia. If quick system response matters, aluminium or steel panel units are usually easier.

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Cast iron radiator installation in Israel — weight, fixings, connection, prices | KABLAY