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Tankless Hot Water Heaters, Efficient, Effective, Endless.
Posts tagged fahrenheit
Takagi Tankless Condensing Unit
Feb 9th
Takagi Tankless Condensing Unit
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The Takagi Flash T-H1 tankless water heater is a new condensing unit available to house hold consumers. 
This tankless heater has an average efficiency of 95% with propane as its fuel source and 92% when natural gas is used. In our Canadian climate you can expect about 4 plus gallons per minute in the dead of winter, and much more in the summer when ground water is warmer.
The Flash T-H1 is able to provide about 3 simultaneous showers when ground water is at or below 40 Fahrenheit. This tankless is unique in that it has two heat exchangers which enable the water passing through to absorb much (90 to 97 percent of it) of the heat generated from combustion. The stainless steel secondary heat exchanger has been added to collect waste heat from the units vent stack and divert it to pre-heating the incoming water. This secondary exchanger causes some condensation that is slightly acidic, Takagi has included a collector and a built in neutralizer that allows the drainage to be plumbed into your standard drainpipe.
This tankless water heater employs a variable gas input which allows the unit to produce only the amount of heat necessary to warm the water to a household’s desired temperature. At a maximum this tankless can produce 199,000 BTU’s per hour and in ideal conditions provide 10 gallons of hot water per minute.
There is a downside, the Takagi condensing tankless water heater is quite expensive, but it is one of the higher end units with a very high efficiency rating. Also unless you buy the Takagi temperature controller you are limited to only 4 preset temperatures, 113 F, 122 F, 140 F, and 182 F.
This is a very interesting system but we havent had any direct hands on experience to draw on yet. We should be getting a trial system soon at which point we will provide a new update and evaluation.
Tankless Sizing – Total GPM
Dec 4th
Buying a tankless system can be a tricky task as there is a number of different units on the market today. In addition you need to take into account numerous different factors to determine the correct sizing and venting.
You will first want to figure out what the total GPM that you need supplied at your house, do this to calculate the total.
If your showerhead is relatively new, the gallons-per-minute consumption rating is inscribed somewhere on the outside of the fixture. If it’s not, do this quick test.
Hold a 1-gallon container under a faucet or fixture and time how many seconds it takes to fill the container with the faucet opened all the way. Then divide 60 by the number of seconds it took to fill the container. For example, a fixture that filled the container in 30 seconds would be rated at 2 gpm.
While you’re at it, it’s a good idea to clean any screens in the fixtures of any scale deposit.
The maximum gpm rating your water heater needs depends on how many fixtures and appliances will be drawing hot water at the same time. Add up the gpm of your fixtures and then check off the fixtures and appliances that will be in use simultaneously. This should provide you with the Total Gallons per Minute that a tankless will need to provide.
Now the last thing to consider is your location, if you are in the southern US the incoming water supply will be much warmer than in the dead of winter in southern Ontario. This plays a significant factor as the tankless unit needs to heat the water almost twice the amount, inturn reducing the output. A tankless rated at 6.8 gpm may only be able to produce 4.8 when it has to heat the water from 38 Fahrenheit instead of 64.
Of course if this is too complicated you can always have a professional come out for a free quote and have them size one out for you. Click here if you are interested.
