Floor of space is 16 sq meters. Second space is 4 meters wide and 5 meters long. Which space is bigger?.

See page 15-16 of owners book





You may need expansion tank, as water heats ether may not be enough space for water to expand as heated. perhaps a different plumber or company.

1) Add tempering tank to preheat incoming cold water.
http://waterheatertimer.org/Tempering-tank.html

2) Read product manual or call Bosch to make sure unit works with pre-heated incoming water. Some incoming water sensors will not trigger combustion is incoming water exceeds certain limit.

2a) Read product manual for required yearly/monthy maintenance.
Train wife to delime tankless yearly.

3) Install bigger gas meter.

4) Solve entire moneypit problem today for $325
http://waterheatertimer.org/How-to-install-gas-water-heater.html

5) Don't install tankless unless you have a lot of money and time for headaches.
Don't believe promotional literature. Tankless promotion is BS for average do-it-yourself folks who want to save a buck on water heating. Estimated yearly saving of $100 means Tankless do not save money long term. All costs are energy: Purchase price and installation negates several years saving up front. One repair will negate another 5-8 years energy savings. By then you need new unit.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Any 6 gal will fit in same cut-out (hole) . 12-5/8" H x 16-1/4" W x 17-5/8 deep. In order to move up to a 10 gal, you need to be able to cut hole a little bigger. 15-3/4" H x 16-1/4" W x 20-5/8" deep. Usually your depth will allow , and width is same, just a matter of whether you have room to make height bigger.

1) You want simultaneous operation.
http://waterheatertimer.org/How-to-wire-water-heater-thermostats.html#simultaneous

2) Installation REQUIRES bigger circuit breaker and bigger wire.
Or 2 circuit breakers and 2 wires
Or change both elements to 2000 watt.
http://waterheatertimer.org/Color-codewire.html

3) MUST add ECO-protected thermostat to lower part of tank.

4) Warranty will be void.

5) If tank is rusted, the added heat and expansion could hasten rupture.
http://waterheatertimer.org/Replace-anode-rod.html

6) As general rule, the health department will not allow this tank conversion for restaurant code to meet dish washing consumption unless manufacturer certifies tank.
But manufacturer will not certify ordinary residential water heater for commercial simultaneous application. Commercial simultaneous tanks can cost 2-4 thousand so they can meet restaurant code and deliver sustained high temperatures for washing dishes.

6) Also consider Hatco booster heater for commercial dish washing.
This type heater has 2 sets of non-simultaneous elements to heat large tank of hot water.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

3000 ft² = 278.709 m²

courtesy of:

http://www.metric-conversions.org/area/square-feet-to-square-meters.htm

It sounds like the box is bad.
http://waterheatertimer.org/Whirlpool-Energy-Smart-electric.html

For second opinion:
Call Whirlpool number that shows in manual.
Person answering phone will want product number and serial number that is located on label on side of tank

Manual says:
1-877-817-6750
When calling for assistance, please have the following
information ready:
1. Model Number
2. 7 Digit Product Number
3. Serial Number
4. Date of Installation
5. Place of Purchase

16" diameter water heaters could work if you cut away the metal and insulation off of 1 side of the water heater. The actual tank inside the shell is smaller than outside diameter.

American gas water heaters shows a 30gal 16"
model BFG61-30T30-3NOV
http://www.americanwaterheater.com/products/pdf/NRGSS00107.pdf


AO Smith has 16" Promax 30 gallon gas
Model GCV30
http://www.hotwater.com/lit/spec/res_gas/ARGSS01406.pdf

ELECTRIC 6 gallon point of use
http://www.hotwater.com/lit/spec/res_elec/AOSRE50400.pdf

You can get a tankless water heater if you have the additional money and a water filtration and softener system and don't mind expensive repairs if you install it yourself.

when to local dist. got owners manuel which after installing 4 of these uints the person impersonating a plumber took with him. easy to understand tbl shooting. resolved tbl. thanks

it could be an air handler in the attic, do you have gas or ele. some are built into the water heater if it is gas, do you have base boards running around the bottom of your floor or air vents with am ac condesor outside if this is the case it could be either the crawl space or attic

try this, set the bottom therostat if it is electric , 10 degrees hoter than the top is set , if gas have no ideas