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Vitocell 300-H, EHA Series Technical Data
Multiple Tank Installation
Product Installation
Total capacity of tank battery USG (L) 184 (700) 238 (900) 357 (1350)
Number of storage tanks 2 2 3
Storage capacity per tank USG (L) 92 (350) 119 (450) 119 (450)
Layout Max. number of tanks which may be stacked on top of each other.
Recovery rates*1
with a temperature rise
of the domestic hot water
from 50 to 140°F (10 to 60°C)
and heating water supply
temperature of . . . . . . at the
supply flow rate stated below
194°F MBH (kW)
(90°C) GPH (L/h)
478 (140)
636 (2408)
560 (164)
744 (2820)
839 (246)
1116 (4230)
176°F MBH (kW)
(80°C) GPH (L/h)
348 (102)
462 (1754)
423 (124)
564 (2132)
635 (186)
864 (3198)
158°F MBH (kW)
(70°C) GPH (L/h)
232 (68)
312 (1170)
266 (78)
354 (1342)
399 (117)
534 (2013)
Supply flow rate
for the recovery rates stated
GPM (m
3
/h) 44 (10) 44 (10) 66 (15)
Recovery rates
with a temperature rise of the
domestic hot water from
50 to 113°F (10 to 45°C)
a steam pressure of . . . .
and a max. steam velocity of
164 ft/s (50 m/s)
7b psig MBH(kW)
GPH (L/h)
566 (166)
1080 (4078)
566 (166)
1080 (4078)
850 (249)
1620 (6117)
15 psig MBH (kW)
GPH (L/h)
717 (210)
1362 (5160)
717 (210)
1362 (5160)
1075 (315)
2046 (7740)
Standby losses*2 MBH/24 h 12.0 13.2 19.8
WARNING
In a multiple tank installation, it is recommended that an
additional high limit aquastat be installed in the common
domestic hot water supply header to the system.
This aquastat should be wired in series to the operating
aquastat on the tank battery. The setting on this
additional high limit aquastat should be approximately
9°F (5°C) higher than the operating high limit.
Ensure that temperature tempering valve(s) is/
are installed if the domestic hot water storage tank
temperature exceeds 140°F (60°C) to protect from
scalding.
Consult plumbing codes and authorities for local
requirements.
Installation of additional aquastat(s)
*1 When planning for the recovery rate as stated or calculated, allow for the corresponding circulation pump.
The stated recovery rate is only achieved when the rated output of the boiler is equal to or greater than that
stated under “Recovery rates”.
*2 Measured values are based on a room temperature of 68 ºF (20 ºC) and a domestic hot water temperature of
149 ºF (65 ºC) and can vary by ±5%.
Three possible combinations are shown below as examples.
Note the maximum number of tank units which may be stacked upon one another.
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