THERM Tankless Water Heaters Applications Manual
| Data subject to change without notice | 01.
THERM Tankless Water Heater Applications Manual |3 Table of Contents 1 Introduction 4 2 Bosch THERM Model Certifications 4 3 Tankless Water Heater Accessories 5 4 Water Quality 6 5 Pump Sizing 7 5.1 Pressure drop curves 5.2 Domestic hot water circulation 5.3 Tank loading 7 8 8 6 Water Heater Sizing & Specifications 9 6.1 Sizing tankless water heaters 6.2 Bosch tankless water heater specifications 9 11 7 Outdoor Installation 13 8 Domestic Water Heating Applications 14 8.
| THERM Tankless Water Heater Applications Manual 1 Introduction This Applications Manual is intended to present some of the most common applications of the Bosch Therm tankless water heaters. Application drawings are shown with both piping and corresponding electrical schematics where applicable. Auxiliary equipment depicted does not necessarily represent any one manufacturer or specific model number.
THERM Tankless Water Heater Applications Manual |5 3 Tankless Water Heater Accessories Available accessories Table 1 C 1210 ES/ C 1210 ESC C 1050 ES 940 ESO 940 ES 830 ES √ √ √ √ Vertical vent kit (part# ESVVT) √ √ Horizontal vent kit (part# 4TWHVK3SII) √ √ √ √ Concentric Vent/air Intake kit - stainless steel (part# ESHCK) Concentric termination kit - PVC (part# 196016) √ √ Exhaust / intake bird screen (part# L2594) √ √ Outdoor kit (part# BTOK) √ √ Wireless remote control (part
| THERM Tankless Water Heater Applications Manual Available accessories continued Table 2 660 EF 660 EFO Pipe cover (part# BPCKIT) √ √ Remote control - for U.S.
THERM Tankless Water Heater Applications Manual |7 5 Pump sizing The following section outlines sizing pumps for domestic hot water circulation and tank loading. Only models approved for such applications are listed in this section. Pump must be bronze or stainless steel. Size the pump according to the system pressure drop chart below. Maximum flow allowed through the recirc loop is 5 GPM.
| THERM Tankless Water Heater Applications Manual 5.2 Domestic hot water circulation 5.3 Tank loading Must provide a recirculation flow above 1.7 GPM. This can be verified in the control unit diagnostics section of the installation manual; mode P4 – 3d. Note: The Grundfos model 15-55 has been tested and shown to work on recirculating systems up to 120 feet of total pipe length. System conditions vary and each pump must be sized by a professional to insure performance.
THERM Tankless Water Heater Applications Manual |9 6 Water Heater Sizing & Specifications This section describes the water heaters available from Bosch Thermotechnology Corporation and provides a general overview to the specifications of that particular model. More detailed information is contained in the installation manuals. Download these manuals at www.BoschPro.com. 6.
| THERM Tankless Water Heater Applications Manual GPM 12 11 10 9 8 7 6 5 C 1210 ES/ESC C 1050 ES 4 940 ES/ESO 830 ES 3 660 EF/EFO 2 520 PN/HN 330 PN 1 0 10 20 30 40 50 60 Gas Appliance Sizing Chart • 70 80 90 Degree rise (°F) Flows above 10 GPM assume installation of a mixing valve to help mitigate pressure drop in the water heater and plumbing system Data subject to change without notice | 01.
THERM Tankless Water Heater Applications Manual | 11 6.2 Bosch Tankless Water Heater Specifications Technical Specifications Model C 1210 ES/ESC C 1050 ES Gas input (BTU/hr) Min: 25,000 Max: 225,000 Max: 199,000 Max: 199,000 Max: 199,000 Max: 175,000 Minimum flow to activate (GPM) 0.5 0.5 0.5 0.5 0.5 Maximum flow rate at 35° rise (GPM) 12.1 10.5 9.4 9.4 8.3 Maximum flow rate at 90° rise (GPM) 4.6 3.9 3.6 3.
| THERM Tankless Water Heater Applications Manual Technical Specifications continued Model 660 EF 660 EFO 520 HN 520 PN 330 PN Gas input (BTU/hr) Min: 20,000 Min: 20,000 Min: 30,735 Min: 31,000 Min: Max: 140,000 Max: 140,000 Max: 117,000 Max: 117,000 Max: 74,900 Minimum flow to activate (GPM) 0.5 0.5 0.5 0.5 0.5 Maximum flow rate at 35° rise (GPM) 6.6 6.6 5.2 5.2 3.3 Maximum flow rate at 90° rise (GPM) 2.6 2.6 2.0 2.0 1.
THERM Tankless Water Heater Applications Manual | 13 7 Outdoor Installation The models listed below are designed to be installed indoors. However, they are approved for outdoor installation when installed with the Outdoor Kit (part# BTOK): 830 ES 940 ES/ESO C 1050 ES C 1210 ES/ESC Outdoor Kit (BTOK) installation: The installation of this outdoor kit (BTOK) is required when installing any of the above appliances outdoors. Outdoor cap easily retrofits to these indoor models.
| THERM Tankless Water Heater Applications Manual 8 Domestic Water Heating Applications Potable water Potable water is water that is suitable for drinking. Bosch Water Heating appliances are approved to heat potable water only. Heating any other liquid other than potable water will void the manufacturer’s warranty covering the appliance. Introduction This chapter covers the various application techniques Bosch Water Heating recommends.
THERM Tankless Water Heater Applications Manual | 15 8.1 Low volume applications Low volume applications cover the small applications in which a large water heater would be inefficient. Common applications for these appliances include cottages, cabins, and summer camps. The Bosch THERM 330 PN gas tankless water heater offers a compact and lightweight design for easy installation in these applications.
| THERM Tankless Water Heater Applications Manual 8.2 Whole house applications Whole house applications cover the typical home applications up to a 2 or 3 bedroom house. See the sizing guide (page 9) to determine the best Bosch water heater model for your application. An enhanced design including an Ariston mini tank in line to the hot water source will reduce the wait time for hot water and improve temperature stability. 8.2.
THERM Tankless Water Heater Applications Manual | 17 8.2.2 Bosch gas water heater with buffer tank Below is an example of a Bosch gas tankless water heater installation for the whole house. An Ariston mini tank is installed in line for reduced hot water wait time and increased temperature stability.
| THERM Tankless Water Heater Applications Manual 8.2.3 Bosch gas water heater with domestic recirculation loop The circulator should be controlled by an external aquastat or with a timer to run only during times of expected hot water usage. Insulate piping in hot water recirculation loop to limit heat loss.
THERM Tankless Water Heater Applications Manual | 19 8.2.4 Bosch gas water heater with direct recirculation loop Use a circulator, aquastat and/or timer, to keep a loop of hot water constantly hot and ready to use. This limits wait time for hot water delivery to the tap and excessive waste of water. Insulate piping in hot water recirculation loop to limit heat loss. See Chapter 5.
| THERM Tankless Water Heater Applications Manual 9 High Volume Potable Water Heating Potable water Potable water is water that is suitable for drinking. Bosch Water Heating appliances are approved to heat potable water only. Heating any other liquid other than potable water will void the manfucturer’s warranty covering the appliance. Introduction This section lays out the options for high volume water heating for large residential and light commercial applications including continuous flows. 9.
THERM Tankless Water Heater Applications Manual | 21 9.1.1 830ES, 940ES/ESO, C1050ES, C1210ES/ESC intelligent cascading with domestic hot water recirculation For applications with 200ft of pipe or more. System parameters: • The plumbing must be connected in the reverse return method with a minimum number of elbows to aid in balancing pressures between the appliances. • Locate appliances close together for improved performance. - Maximum distance between appliances: 36”.
| THERM Tankless Water Heater Applications Manual 9.1.2 830ES, 940ES/ESO, C1050ES, C1210ES/ESC intelligent cascading with domestic hot water recirculation For applications with 200ft of pipe or less. System parameters: See Chapter 5.1 for recirculation pump parameters • The plumbing must be connected in the reverse return method with a minimum number of elbows to aid in balancing pressures between the appliances. • Locate appliances close together for improved performance.
THERM Tankless Water Heater Applications Manual | 23 9.2 Parallel unit applications Two Bosch water heaters plumbed in parallel will have double the flow rate. However, the activation rate increases with each unit added in parallel. Example: 1 unit - 0.5 GPM activation rate 2 units - 1.0 GPM activation rate 3 units - 1.
| THERM Tankless Water Heater Applications Manual 10 Residential Solar Applications Aquastat / Water Heater setpoints Introduction This section gives a general overview of tank loading and in line booster applications for domestic hot water in conjuction with solar water heating. For additional system details, consult the Bosch Solar Technical Guide 10.1 Tank loading 10.1.
THERM Tankless Water Heater Applications Manual | 25 10.2 Booster applications System parameters: 10.2.1 Solar DHW system with gas tankless water heater booster The tankless water heater only runs when solar water needs a boost. The Ariston mini tank provides small amounts of DHW instantly and increases comfort by buffering DHW temperature. See applicable models listed in the figure below.
| THERM Tankless Water Heater Applications Manual 10.2.2 Solar DHW system with gas tankless water heater booster and recirculation loop Similar to 10.2.1 with domestic hot water recirculation added. The tankless water heater only runs when solar heated water needs a boost. Buffer tank provides small amounts of DHW instantly and increases comfort by smoothing out DHW temperature. See applicable models listed in the figure below.
THERM Tankless Water Heater Applications Manual | 27 11 Commercial Solar Applications System parameters: Introduction This section provides a general overview for commercial hot water systems in conjuction with solar water heating (e.g. schools, fitness centers). For additional system details, consult the Bosch Solar Technical Guide. Honeywell AM101 Thermostatic Valves required for proper operation. For optimal performance, the flow through the water heater should be between 3.
| THERM Tankless Water Heater Applications Manual 12 Commercial Water Heating Applications Introduction This section gives a general overview of high volume, high temperature water heating for commercial applications. 12.1 Commercial Kitchen applications 12.1.1 Commercial kitchen This design allows for temperature stability with short, repeated hot water demands such as a super sprayer. It also provides high temperature water for a commercial dishwasher.
THERM Tankless Water Heater Applications Manual | 29 12.1.2 Commercial kitchen with domestic hot water recirculation System parameters: For optimum performance in applications involving a commercial dishwasher, a hot water circulation loop is recommended. See Chapter 5.
| THERM Tankless Water Heater Applications Manual 12.2 Basic tank loading with domestic recirculation Aquastat / Water Heater setpoints The following application outlines general tank loading with one or more gas tankless water heaters in parallel. Domestic hot water recirculation shown is optional.
THERM Tankless Water Heater Applications Manual | 31 12.3 Advanced tank loading commercial hot water system Aquastat / Water Heater setpoints The following application outlines an advanced tank loading application for commercial hot water systems (e.g. hotels, fitness centers). This design allows for complete isolation of the system for maintenance reasons and gives the ability to bypass certain system components in case of failure.
Bosch Thermotechnology Corp. 50 Wentworth Avenue Londonderry, NH 03053 Tel: 1-866-642-3198 Fax: 1-603-584-1687 www.bosch-climate.us BTC 740001301 B | 01.
