Good day, I currently have a 18L GenX Smart Gas Geyser, but the diaphragm torn and I cannot find a replacement 40mm diaphragm. Which brand gas geyser will you recommend to buy, but doesn't cost an arm and a leg. Currently we are 3 people in the household and use the geyser for all our day-to-day hot water, i.e. dishes, showering, but I cannot keep on replacing a gas geyser every 16 months as I do not get parts if needed. Thank you