With the idea there is nothing wrong, maybe a bit too large for just 1 engine but it will look nice on the bench and will do the job. I do not get the idea of the timer, it does not give any readout if you have used it long enough but if they think it is needed....

And is 110v a problem? Last I was finding out how a 110v flim studio sunlight lamp can be modified for 220v, a 300w 220/110v transformer just cost 50 bucks, that is a small investment, OK, if the same heater is still used it should draw 850w but even then a converter can be found.