Flow & Temperature Adjustment for Bosch 1600P

The new Bosch 1600P that comes in either natural gas or liquid propane has a control knob for adjusting the flow and a slide adjustment for adjusting the heat on the front of the heater.

The Bosch AquaStar 1600P is a 117,000 BTU Gas Tankless Water Heater. The control knob on the right is the Temperature Adjustment knob and is for adjusting the flow of water through the heater which has the ability to speed the flow of water up making it cooler or slowing it down and making it hotter. The slide control in the middle is for adjusting the temperature of of the water by adjusting the height of the flame. When the slide is positioned on the small flame symbol the burners will be low and when the slide is on the high flame symbol the burners will get higher and the temperature hotter.

Below is how turning the Temperature Adjustment knob effects the heater:

Knob Position		Clockwise		Counter-clockwise
Degree Rise		90° F		45° F
Activation Rate		0.5 GPM		1.1 GPM
Max Flow Rate		2.0 GPM		3 .7 GPM

As the temperature adjustment knob is turned counter-clockwise, the output temperature will lower and the activation rate of the heater will be raised. Turning the knob clockwise will raise the temperature and lower the activation rate.

When sliding the slide adjustment to the left small flame will give lower flame and cooler temperatures and sliding the slide to the right will give hotter tenmperatures and a higher flame.

The Bosch 1600P has a gas control slide that modulates burner input in response to flow. Its purpose is to ensure that the hot water temperature will remain steady, although the water flow demand might vary.

Bosch 2700ES Vs. Bosch Pro 715ES - A Comparison

The Bosch AquaStar 2700ES tankless hot water heater is similar in many respects to the Bosch Pro 715ES tankless hot water heater.

They are both 199,000 BTU tankless water heaters and they both sit in the same chassis or case - the new "World 2" case.

Both have modulating gas valves and have the same .65 GPM minimum activation rate.

There are a few key differences between the two heaters, though.

One key difference is that the Bosch 2700ES comes with built-in freeze protection. This freeze protection is meant to keep the heater from freezing in locatons that experience occasional overnight freezes. The Bosch Pro 715ES does not come with this freeze protection -- but it is an optional accessory that you can pay extra for.

Another difference between these two heaters is the water filter.

In the Bosch 2700ES tankless hot water heater the water filter comes with the heater and is very easily accessible without having to even remove the cover. As you can see from this image, (1) is the water filter.

Bosch recommends that you inspect and clean the water filter once per year as part of your annual maintenance of the heater.

With the Bosch Pro 715ES, the water filter is an optional accessory - albeit a highly recommended accessory!

The Bosch Pro 715ES is a wholesale product that is meant to be sold directly to an installer. It is designed to be professionally installed. As such, it comes with a 15 year warranty. The Bosch 2700ES is a retail product that is meant to be sold directly to home owners and it comes with a 12 year warranty.

Steve