Hey plumbers! Instant hot water at kitchen sink.

I Reeeeally need to build a basement for my RV.

I did mine mainly for boondocking. Tee into hot water line at galley wit a 1/4" line to the inlet side of the water pump. In that line put a 12v selanoid valve. Control that valve with a remote control on/off switch with 2 remotes, one in the bathroom, one in the galley. Push the button and circulate water from the water heater, back to the tank/pump inlet, count to 20 and water is hot. It can be used on city supply but need to make sure you don't forget that it's on, it will over fill the water tank.

Yaj wrote:
Our water heater is on the other side of the coach and it takes quite awhile to get hot water. It also wastes quite a bit of water waiting for it to get hot, sinks or shower. I wonder if I closed the sprayer for the shower completely, opened the feed valves and waited a while, would I get hot shower water faster?

Your on to it. With insulated lines you actually increase capacity and with it available instantly use less. Bonus for boondockers.

Our water heater is on the other side of the coach and it takes quite awhile to get hot water. It also wastes quite a bit of water waiting for it to get hot, sinks or shower. I wonder if I closed the sprayer for the shower completely, opened the feed valves and waited a while, would I get hot shower water faster?

woodgeezer wrote:
So your water heater is next to the faucet? Why would you want to add a bunch of plumbing to get hot water a few feet a few seconds faster?

Think about it.

woodgeezer wrote:
So your water heater is next to the faucet? Why would you want to add a bunch of plumbing to get hot water a few feet a few seconds faster?

I must agree. Much ado about nothing and a lot of wasted effort. How water "now" or 3 seconds later? HMMM. Am I missing something?

Yes it will and does work. But, you are heating the circulating water all the time. Unless you have a need for instant hot water all the time, you will spend a lot more heating all the time, rather than just keeping the water in the tank hot. With a pump, you can save some by insulating the pipes. You can try it by putting a valve on the end of your kitchen faucet, then leaving both the how and cold valves on. Then both the hot and cold lines will contain cold water, and if you want cold, you have to run out the hot.

So your water heater is next to the faucet? Why would you want to add a bunch of plumbing to get hot water a few feet a few seconds faster?

motorcycle jack wrote:
The way to do this is:

1. run a line from the hot water feed at the faucet to the cold water intake on the hot water heater.

2. put a one way flapper valve in this return line so the open side feeds the cold water inlet connection.

How it works: Hot water goes to the faucet and sits there. As it cools it sinks thru the flapper valve an to the cold water feed line of the hot water heater. The flapper prevents cold water from going up to the hot water faucet. It works very well in a home situation by convection cooling but not sure how it would work in an RV.

Ok, so looking at the picture of my hot water heater plumbing I would install a T in the incoming blue line at the bottom left. Then install a T in the hot water line up near the faucet. Now run a new line between these T's with a one way valve allowing the hot side access to the cold side. Yes?

The way to do this is:

1. run a line from the hot water feed at the faucet to the cold water intake on the hot water heater.

2. put a one way flapper valve in this return line so the open side feeds the cold water inlet connection.

How it works: Hot water goes to the faucet and sits there. As it cools it sinks thru the flapper valve an to the cold water feed line of the hot water heater. The flapper prevents cold water from going up to the hot water faucet. It works very well in a home situation by convection cooling but not sure how it would work in an RV.