I am not technician the problem with the boile started with the automatic and the thermostat and change them and it lasts lasts more than 40 minutes warming up automatically turns off but the water does not heat hot the dance uses lp gas does not dance of step

greetings zinat, should indicate brand and model of boiler, is it gas to step, deposit, ,, how many liters of water, is heater, solar? Is it safe to have water supply? Did I check that the boiler is more than 5 liters? _ if it is a deposit check that in the fireplace has the deflection plate and on the side of hot water the black tube that serves to keep the temperature constant How far is the boiler from the water faucet you mention? the boiler is on the ground floor and the key is also on the top floor _reviso that the water tank has enough height to have water pressure