Heating up a cafe options

Hi everyone. I have spoke with my father in law about heating up his cafe. It is quite a big place and he currently has no heating system installed. He does have the pipe work and radiators in place for an old central heating system, but currently only has an immersion heater installed for hot water at sinks. He wants to know the cheapest but most affective ways of heating up the cafe. He has asked me if a warm air heating system is an option? I have no experience with heating systems so I thought I would ask on here. Electric heaters would be an option too as long as it heats up the area affectively and is cost affective.

Would have thought natural gas (if there is a gas main available) would be the most efficient/ cheapest to run.

roys said:

Would have thought natural gas (if there is a gas main available) would be the most efficient/ cheapest to run.

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There is a gas main available. Would just be a case of running a pipe to the boiler.

I think you need a gas/plumber for this Tony. Gas would be cheapest, effectively new pipes to new boiler for gas and water and radiators job done. 

Get a heating guy in Tony .  Get the existing system pressure tested  etc & go from there .  Gas is going to be the best option .