Tankless Water Heater

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G

Greg1190

Joined
Dec 28, 2006
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21
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Location
Pico Rivera
Anyone have one? What should I look for and what should I stay away from? I have two full baths for a family of four. I would like some imput prior to making a purchase. Thanks
 
i dont know how to properly size them..sorry. but i do have a word of advise........do not undersize to save a little coin. with these heaters, if you excede the flow rating, like when your wife turns on the dishwasher in the middle of your shower, too much cold water flows past the coil and cools it. ZERO hot water until the flow is decreased. when this happens, and it will (amhik), dont turn up the hot flow, turn it down. turning up the hot will only keep the coil cold. turning it down reduces the flow and restores the hot water. counter intuitive to the old 40 gal. tank system.
 
I recently shopped around for them. Keep in mind that your existing vent is probably 3" and galvanized steel. Those tankless heaters require 3"-5" stainless vents. Some require 120 Volt power supply so if your heater is in the garage that may not be a problem however if its located indoors like mine you will need to tap into an existing circuit for the power. Or you can go with the units that don't need AC but I found those are the ones with the larger vents so roof work would be necessary. I just threw a tanked 50 Gal back in and called it a day.
 
Had Bosch Aquastar 125 NG needs no electricity, just NG hookup and vent. Can only do ONE hot water thing at a time, One shower, etc.

Now have moved, have Rinnai, has power vent so electricity is necessary, can adjust heat up to 140 degrees, it runs a shower, washer, dishwasher with no problems. Previous posts very true, go big or don't do it, Saves lots of gas and very user friendly.
 
They are very nice provided they are sized properly. You need to estimate your max demand in GPM. Turn on each device and flow into a measurable container and time it. I would up size from your measured demand.

Also you will never run out of hot water. Be aware of this with kids/teenagers.

Payback is somewhat long as I recall.
 
 
awesome

i have a takagi jr for my 3 bed 1 1/2 bath house and love it, bought it last year when there was still a tax credit for these. my gas bill dropped between 20 and 40 a month. Can only use two small things or one shower at a time but havnt we all been trained that way with a traditional hot water heater?
 
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