Natural gas heater examples

Here are some natural gas heater examples illustrating what each one is able to cope with. In each case, we consider 2.5 gallons per minute (GPM) to be an average single standard use:

One major use:

Bosch AquaStar 1600P / 125B - Standing Pilot - Gravity Vent.

Bosch AquaStar 1600H / 125HX - Hydron Spark Ignition - Gravity Vent.

Bosch AquaStar 1600PS / 125BS - Standing Pilot - Solar Booster or as Stand-Alone heater - Gravity Vent.

Takagi T-KJr - Electronic Ignition - Optional Direct Vent - Horizontal or Vertical Power Vented.

These will give you a maximum output of 4.0 GPM. A 50 degree water input and a 55 degree temperature rise will give you 3.3 GPM, enough for a standard shower (2.5 GPM) and maybe a small sink at the same time.

Two major uses:

Bosch AquaStar 2400ES / 2400E - Electronic Ignition - Direct Vent - Horizontal or Vertical Venting

Takagi T-K3 - Electronic Ignition - Horizontal or Vertical Power Vented - Optional Direct Vent

These heaters will give you a maximum output of 6.35 and 6.9 GPM respectively. A 50 degree water input and a 55 degree temperature raise will give you 5.3 and 6.0 GPM respectively, enough for two standard showers simultaneously.

Bosch AquaStar 2700ES - Electronic Ignition - Direct Vent - Horizontal or Vertical Venting will give you a maximum output of 7.15 GPM. A 50 degree water input and a 55 degree temperature rise will give you 5.9 GPM, enough hot water for two standard showers and a bathroom sink.

Three major uses or more:

Takagi T-M1 - Electronic Ignition - Horizontal or Vertical Power Vented will give you a maximum output of 9.6 GPM. A 50 degree water input and a 55 degree temperature rise will give you about 7.0 GPM, enough for two standard showers and a sink at the same time. In warmer climates with input water of 60 degrees you could run 3 single shower head showers at one time.

These natural gas heater examples illustrate what each one is capable of heating.