Tankless Water Heater Inlet Size Question
glargle
10 years ago
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glargle
10 years agoRelated Discussions
Help sizing a tankless water heater
Comments (2)Okay... Size your heater for the worst case, about 35 degree inlet and 5 gpm. I normally design for 105 degree shower, but you say you like it hot, so 110. The manufacturer will provide the table that shows the temp rise at a given flow rate. Ignore the "efficiency rating"... it's bs. Stick with the energy factor. I think they need an energy factor greater than .80 to qualify for the tax credit. Don't bother with one less than that. You will not see a significant savings between the .80 and the condensing unit. Only go condensing if you need to vent with PVC pipe to get the vent cost down....See MoreNew water heater - size? Consider tankless?
Comments (8)Jake, I was reading your post here, and was wondering if you could give me advice on my situation. I currently have a gas powered hot water heater. It is located in the basement of our 2-story home. It heats the water for the front loading washer (in the basement), dishwasher, kitchen sink (both on the first floor), shower and bathroom sink (on the second floor). While the hot water heater seems to work OK (it does leak from the pressure valve for some reason) I have the same problem many others have - it takes a long time, and a lot of wasted water, before it comes out warm/hot. I have heard about the tankless water systems, but don't know anything about them. Is one enough for the whole house? Do you get one for each faucet? There are only two of un in the house, so our overall water usage is small compared to a larger family. I can imagine we would want to have hot water in the shower and maybe a sink. We usually don't run more than one appliance at a time. I would like to get hot water to where I want it faster than I currently do, and I would like to save water and energy. Is there a system that can be recommended for my household? Does a regular hot water heater make sense? If there is an alternative, what would that be? Thanks for all of your help. Tim...See MoreFeeding my 85 gallon tank water heater with a tankless water heater
Comments (16)First off let me say that is an insane amount of water, for a residential setting. Really insane for California where there is a shortage of the resource to begin with. It is an interesting idea though. I know nothing about this kind of setup. There are only two people in my home and we get along fine with 40 Gallons of water in a tank with plenty to spare. When the kids were here though we could see issues if everyone decided they wanted to shower at the same time as we do have 3 bathrooms. If I were going to attack this idea, I would put the tankless after tank. In this way (at least in theory) the tankless would only operate at full capacity once the water in the tank was exhausted? Or as the water began to cool the tankless would ramp up. That theory based on how hot the water is flowing into the tankless and whether or not the tankless would operate at a lower setting or not at all if hot water was already flowing through it. I don't know the answer to either one of those questions. As far as those rain shower heads, not a fan. I have a family member who has one, not the best shower experience I have had. To each his/her own though....See MoreSizing Tankless Water Heater
Comments (1)There is little cost savings to installing less than ~199k btu unit. I wouldn't be surprised if they stop making them....See Moresnoonyb
10 years agojakethewonderdog
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10 years agoglargle
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9 years agojakethewonderdog
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9 years agoSF Design & Build
8 years agolast modified: 8 years agojackfre
8 years agoMuzila Plumbing & Rooter Inc
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