Posted 2008-05-04 10:08 PM (#83130) Subject: HOT Water On Demand
Veteran
Posts: 164 Location: Delaware
I have an Oster/Coleman Hot Water on Demand. I can not get any pressure out of it. I have tried both pulling from a container and hooking to a hose. Is this a general problem or just my unit?
Posted 2008-05-04 10:45 PM (#83133 - in reply to #83130) Subject: RE: HOT Water On Demand
Expert
Posts: 2453 Location: Northern Utah
I know nothing about the particular product you are asking about.
But in general , Tankless Hot Water Heaters have a complaint of low pressure.
I would love to install the energy efficient products in the new homes I build. But people are just not happy with the water pressure out of such devices.
The few times we have installed them, We've had to go back and add a traditional water heater.
I wouldn't expect a inexpensive portable unit to have as much pressure as a $1000 built in unit.
I guess the real question is "What is low pressure to you" Does it just dribble out of the faucet? or does it come out of the shower with some pressure, but not enough to invigorate your skin? What are you comparing it to when you say low pressure?
Posted 2008-05-05 6:58 AM (#83144 - in reply to #83130) Subject: RE: HOT Water On Demand
Veteran
Posts: 164 Location: Delaware
It has a 6 volt battery and pumps on both the hook up for hose and the unit that drops in the water supply. I don't know how to judge the psi I am getting, but with the unit on a table and the shower head held about a foot above the unit the water is streaming together about 3 inches from the head. I have another coleman product that is the shower you drop into a heater water source and it has more pressure than this (4-D batteries). I just bought a new 6 volt battery for this unit and expected more than what I'm getting. I have heard so many people brag about this unit that I can't believe this is what they are getting. I must say it heats water FAST.
Posted 2008-05-05 8:07 AM (#83151 - in reply to #83130) Subject: RE: HOT Water On Demand
Extreme Veteran
Posts: 406 Location: Minneapolis, MN
I think you have an obstruction in the water line.The temperature rise with on demand waters is dependent on the volume of water that flows through them. The faster the water flows, the less the temp rise.
You state the one that doesn't have good flow, heats really well...that's because the flow of water is slow through the unit....which make me think there is an obstruction in a water line.
Maybe the hand held nozzle is clogged with calcium/mineral build-up?
HOT Water On Demand
I have an Oster/Coleman Hot Water on Demand. I can not get any pressure out of it. I have tried both pulling from a container and hooking to a hose. Is this a general problem or just my unit?
