Temperature controller

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#1
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Sure there more than a million of them in the web,but i intend to make something my own.
I would like to ask about the controlling method,to use an hysteresis for a relay on/off,or tracking the temperature changes by angle phase control for firing a triac gate.
I want to control three room heater panels of 2KW-3KW each in different rooms,and between the two methods which do you consider as the more economical.
One advantage of triac is the ability of slow start avoiding this way the initial surge current of the on state every time the thermostat closes.

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The problem is the transport lag and the way the controller handles this issue.
Soft start is a nice feature but I doubt You want to go phase controlling a few kilowatts of load in a domestic environment without consideration of noise and interference caused by phase control.
Block control with a suitable control regime would be a simpler domestic option.

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LTC1041 - BANG-BANG Controller has a thermostat application.

"Dare to be naïve." - Buckminster Fuller

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I would use solid state relays for the power

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A 16A triac (TO220) is capable of controlling a ~2600W/230VAC resistive heater. These cost about 1$/piece.

No RSTDISBL, no fun!