Expansion tanks are not always required for water heaters, but they can help prevent pressure buildup in the system, especially in closed-loop systems. It is recommended to consult with a professional to determine if an expansion tank is necessary for your specific water heater setup.
I believe that the larger the hot water tank, the greater is the need for an expansion tank. Water expands as it is heated. This is why all hydronic heating systems require an expansion tank. A water heater would need expansion tank when a backflow preventer or check valve is installed in domestic cold water line directly after water meter. Some areas require backflow prevention, but not all. Have to check with local plumbing authority about that.
On-demand hot water tanks, also known as tankless water heaters, offer several benefits compared to traditional water heaters. These include energy efficiency, cost savings on utility bills, longer lifespan, and a continuous supply of hot water. Tankless water heaters also take up less space and have lower maintenance requirements.
Yes, they are GAS tanks, NOT electrical
All water heaters should have a pressure relief valve, otherwise they could burst.
Immersion heaters are used for heating water in a hot water tank. Immersion heaters are usually controlled by thermostat and they will heat your water to a set temperature for as long as you leave it on that setting, or you can have a timer set. It is usually an expensive way to heat water compared to central heating systems with hot water circuits.
Anode rods are used in RV and home hot water heaters. Aluminum tanks are not required to have an anode rod where steel tanks usually are.
A small tankless gas water heater offers benefits such as energy efficiency, space-saving design, and continuous hot water supply compared to traditional water heaters with tanks.
Lochinvar is a website on the internet. Some of the products sold there are commercial solar systems, boilers, water heaters, pool and spa heaters, package systems, and tanks.
In some cases, a water heater may require an expansion tank to help regulate pressure and prevent damage to the system.
Water heaters can make noise due to the expansion and contraction of metal parts as they heat up and cool down, as well as the buildup of sediment in the tank that can cause popping or rumbling sounds.
Lowes, Home Depot and many Sears sell water heaters. You can also get them from plumbing supply shops.
you want your cold line coming tying into both inlets on the water heaters and the hot lines tied onto the outlet side of the water heaters evenly (so they get even draw and one water heater doesen't have to work harder tnan the other). your recirc line coming in ties into the cold line in beetween the two water heaters with a circ pump going twards the cold line and the other end of the circ line tying into the hot line on the furthest fixture. on the cold line coming in you need a ball valve, check valve and expansion tank before it ties into any of the heaters. NOTE: The solution above is for tanks in parallel not in series.