Hello, I would like to know what is better ... I have a passing boiler but it is very cold and my house is two stories and the shower is on the 2nd floor and if the steam fills the bathroom but the water comes out half warm ... .It is better if I buy a gas boiler and it will come out now if it is boiling which is how I would like to ...

reaffirming what the comrade comments, the temperature of your heater goes up to the maximum and check if you notice that there is not much change then one of storage or electric gas.