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Water Heaters
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Watch this interesting video clip below showing a water heater exploding. You'll see there is a valid reason a water heater should be professionally installed and repaired when there are any signs of trouble.
Water Heaters

Whether you need a gas or an electric water heater, 30 gallon short or 100 gallon tall, Carrier Plumbing will be able to size and install the water heater that meets your families needs.
Tip: When getting quotes ask about code up-grade charges.
 (Carrier Plumbing includes a AGA gas valve and dialectric unions free if needed - not as a code up-grade cost).


Tankless Water Heaters

Tankless water heaters have improved considerably over the last 10 years. Although converting to a tankless water heater is normally more than replacing a standard tank model, they have a longer life expectancy (15-25 years) over a standard tank model (10-15 years) and the gas savings can help offset the added cost. When taking all this in consideration, a tankless water heater can be a great choice, but not all homes can be converted to a tankless water heater and there are many factors that go into choosing the correct one for your home and lifestyle. If you know someone that ended up getting a poorly installed or chosen unit, was not properly educated on how they work and the required maintenence - you've already heard how much they truly hate them. If your thinking about converting to a tankless water heater, Carrier Plumbing would be happy to explain the options you may have and give you a free estimate.
A tankless water heater needs to be sized to what the home can handle or the customer is wasting there money. Many installers don’t educate themselves enough and just blame problems on the heater for not meeting the demand.    “Please see the reasons below”

Water demand:

Except for clothes washers and dishwashers, the events above will consist of 80 percent hot water. Multiply your gpm figure by 0.80 to get the gpm of hot water needed for each event.
1Typical shower and bath faucets flow at 2.5 gpm (gallons per minute), which is typically a mix of hot and cold water.
2The typical Consumer Reports-tested clothes washers set for hot-water wash and rinse cycles could draw up to 3.3 gpm of hot water during use.
3The typical kitchen and bathroom faucet will flow up to at 2.2 gpm, which is typically a mix of hot and cold water.
4The typical Consumer Reports-tested dishwasher draws 1.3 gpm of hot water during use.

http://www.consumerreports.org/cro/appliances/heating-cooling-and-air/water-heaters/how-to-size-a-water-heater/tankless-water-heater-calculator/tankless-water-heater-calculator.htm

Next for heating water in Michigan you have to figure about a 65 degree rise (city) & 77 degree rise (well)
So a 9.5 gallons a minute unit will actually only put out about 5.3 GPM city & 4.3 GPM for a well in the winter months, possibly 0.3 more GPM in warmer weather.
This is assuming the gas line is properly sized (see below)

Gas flow rate:

You can see from the chart below how important the size and length is.
If you have a 199,000 BTU tankless water heater and only a 3/4 “ pipe feeding the furnace and water heater, the water wouldn’t heat properly during the winter when the furnace is running and using 75,000 BTU’s 

                                Pipe Size (in)                                                          Pipe Length (ft) & BTU









above chart from   http://www.engineeringtoolbox.com/natural-gas-pipe-sizing-d_826.html

I recommend tapping into a 1” gas line for a tankless water heater that uses over 140,000 BTU, it may cost more but the appliance will work like it’s suppose too. (If you starve the BTU’s the GPM can drop drastically)
As you can see, it is better to work out details before purchasing & installing a tankless heater.

Nominal Inside diameter 10 20 40 80  150  300
1/2 0.622 120,000 85,000 60,000 42,000 31,000 22,000
3/4 0.824 272,000 192,000 136,000 96,000 70,000 50,000
1 1.049 547,000 387,000 273,000 193,000 141,000 100,000