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Water Heater Question

B

Bobl1958

Well-known Member
I am looking at using one of the On Demand hot water heaters to use for warm water for washing my horses before use in public. I would like to just run the garden hose into it and have warm water to wash them.

Does anyone have any experience with them to know if this might work? I may have to have some cold water to filter in to help keep it from getting too hot. Any one have any input? Thanks Bob
 
Should work just fine. They are adjustable so you can turn it down without having to mix in cold water if you don't want to. We use them at work in the rest rooms and they seem to provide unlimited hot water. For the type of use you are looking for I think they would work great.

Greg
 
If propane or Nat. Gas it can be remote easily. The temp can be adjusted for need on most. Drain and blow out if freezing weather exposure. Electric will work as well, but requires pretty expensive wireing if far from a service panel. Jim
 
They are set to heat at a specific flow and work well when that flow is maintained. More flow cooler water. Less flow hotter water.

My sister had one on a well and did not like how it worked on their system. Some one posted on here about putting a pressure regulator on the inlet side to help even the flow. That might work.

How where you thinking of powering this on demand water heater??? They take lots of energy while heating. If your wanting portable then I am assuming propane powered??? Even a small electric one will be 220 volts.
 
Bobl1958,You need to check electrical requirements at the location (barn).To make sure you have a big enough service amp wise to run it.
 
If you have to use electricity rather than propane or natural gas, you might want to just get a 10 gallon conventional hot water heater. I have one, fits under the cabinet in the tack room, works great, and less monkey business than the "on demand" type. Adjust the temp at the faucet, just like in the house.
 
I had friends that installed a unit for use on one bathroom fixture. It came with an airator for the faucet. It literally cut the water flow down to about a half gallon a minute. The water just came out of half a dozen tiny holes in the fitting. It simply would not work for washing animals. You would need something sized closer to a small house unit. Those aren't cheap. May be lots cheaper to put in a 10 gallon tank and turn it off when not used.
 
Water heaters are rated by "gallons per hour" of hot water. Tank water heaters have an additional rating for "first hour gallons".

To size your water heater you need to determine:
A. How many gallons of warm water you need to wash each horse.
B. How many horses you need to wash per hour.
C. What temperature warm water do you want.
D. What is your coldest incoming water temperature during the months when you will be washing horses.
E. What is your power source: electric, propane or natural gas?

I would take that info to a plumbing contractor to size a heater and get a cost estimate. For occasional use, a tank heater with a timer or switch could be your most economical alternative.
 
I have one in my chicken house that will supply enough for 4 people to shower at once, haven't run out of hot water yet. Its the last one on the right in the picture, the little one. The other three are for in floor radiant heat 200k btu each. Rinnia brand, runs off propane fuel.

Nate
a185567.jpg
 
Several very informative replies. This heater would only be used a few times and mainly in the warmer months. The local Lowe's have a smaller 110v unit. I have a 30amp service in the barn so I think it would be big enough.

Again, it would only be used a few times and not for a major wash job but more so to just hose the dirt off.
 
I thought about one of those for the new house. Then realized They don't start heating the water until you turn on the faucet. I was looking for a short wait time for hot/warm water and this wasn't it; installed a tank and a loop on the hot water line. The wait time now is about 2 seconds.

My suggestion: Do you have hot water in the shop bathroom? If so run a hot and cold lines to a mixer fixture close to the door, run a hose from there.
Another suggestion: Is your barn/stable heated? Even if not put an apartment sized water heater out there. If it's an unheated space get one with a pilot light and enclose it with an insulated box/room. Get the quickest recovery time unit you can.
 
The Lowes website shows that their 120 volt tankless heater will generate tepid (90 to 100 degree) water at an ultra low flow rate of .32 gallon per minute. It comes with a flow restricting aerator to install on the sink faucet. This may be OK for washing your hands, but I doubt that it is what you want for washing horses.
 
I have a 60 amp 220 volt in my shop if you can get by on 2 gallons per minute the water will be around 110 degrees the faster you flow the water the cooler it gets. If you just want 60 or 70 degree water compared to 35 degree coming in to it would do that at a faster flow.
 
I haven't used one but there was a guy on Craigslist last year selling some as an attachment to make your power washer a hot water cleaner. Basically he had a two-wheel dolly with a small on-demand unit mounted at the top and a 20-lb propane tank on the bottom, plumbed with garden hose fittings on the in-feed and out-flow sides. No idea how well it would work but would be very portable.
 
There are small on demand tankless heaters out there, Winnebago was installing them in some of the higher end coaches last winter and offered it as an option on other units, don't know if they were 110 volt or 12 volt but they were propane fired. I saw them as they were installed at the end of the line I worked on but I was at the start before any plumbing or propane lines were installed I never dealt with them.
 
If you don't need warm water during freezing weather, add provisions to completely drain the heater and the water lines, or add antifreeze to the system (RV antifeeze?).
 
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