Weil-McLain Ultra Electric Water Heater - Manual (Page 7)

Part number IWHA016A/1103
7
PLUS Line Instruction Manual Supplement
PLUS & PLUS
WATER HEATERS WITH GAS
-
FIRED WATER BOILERS
Notes Tables 1 and 2
Table 1 Combined space heating/water heating applications (see Notes)
Install boiler-to-water heater piping
(continued)
2
1. First hour ratings in Tables 1 and 2 are based on:
• 115°F or 140°F domestic outlet water supply
temperature from water heater.
• 50°F domestic water inlet temperature.
• 190°F boiler water temperature leaving Ultra boiler.
• Circulator and pipe sizes as given in the Tables.
2. If the net Btu/hr rating of the boiler is close to the
space heating load (for combined systems) — or if
there is an unusually large demand for domestic
water — increased boiler capacity may be required.
Table 2 Dedicated water-heating only systems (using circulator supplied with boiler) (see Notes)
Figure 6 Pump curves for Taco circulators