What is the best water heater for hard water?

6 Best Water Heaters for Hard Water 2020 1 – Rheem RTGH-95DVLN 9.5 GPM. This tankless Rheem water heater is very simple to use. 2 – Sio Green IR30 POU. 3 – Bosch Tronic 3000 T. 4 – Stiebel Eltron 224199. 5 – EcoSmart ECO 27. 6 – Takagi T-KJr2-IN-NG. Click to see full answer. Correspondingly, how do I protect my water heater from hard water? Invest in a Water Softener A quality water softener removes ions from water that cause water hardness, which includes calcium. By removing the element from the water before it enters the water heater, water softeners stop calcium buildup before it starts.Furthermore, how long do water heaters last with hard water? 8 to 12 years Similarly one may ask, how does hard water affect water heaters? If your home has hard water, hardness minerals can solidify in the form of limescale and build up on the bottom of your water heater’s tank. If you have an electric water heater, limescale can cause similar problems by building up on your water heater’s heating elements and reducing their effectiveness.Do tankless water heaters work with hard water?Tankless water heaters are not immune to hard water either. However, the effects on tankless water heaters are minimal and time delayed. As water moves through the heat exchanger, the minerals will drop out of suspension, but most of the minerals will be cleared out with the water flushing through.