Replace copper capillary thermostat with digital temperature controller relay
RCAS is intended to extend the life of the contacts by absorbing arc energy during shut off to the motor. It must be used on the new relay.  ( plastic cap and power resistor , same values )

Although the thermostat has a 10A relay and the G25 is rated at 10A , 10A relays are only rated for heater loads and not inductive motor loads which generate a hotter arc when the motor acts as a generator shutting down. 

So if you can replace it with a 25A relay , somehow, or get a thermostat to drive a 25A relay, or use the 10A relay to drive a 25A DC relay using the internal supply voltage then it will last longer.  A reverse diode is needed across the DC relay coil to suppress an impulse voltage during shutoff from inductance. 

Remote location of the thermostat may pose noise and attachment problems but needs to be thermally attached like the copper tubes perhaps with thin epoxy.