Floor-standing Instantaneous DHW heater with storage
FWS500 is a module for the instantaneous preparation of DHW, used in conjunction with a 500-liter thermal storage. Designed for small and medium-scale applications, it can provide DHW flow rates from 2 to 40 l/min. The thermal storage enables integration of one or more energy sources, both traditional and renewable (solar thermal, heat pump, biomass generators).
By using the module, technical water will be accumulated instead of domestic water, leading to higher efficiency by storing technical water at a higher temperature. The installation of the FWS 500 product reduces space requirements, installation times, and maintenance, improving hygiene and reducing the chances of Legionella formation in the DHW system.
The product is factory pre-plumbed. It is supplied with a connection for solar systems with a heat exchanger with a surface area of 1.8 m2. It is constructed with 50 mm EPS thermal insulation, a 5 mm PVC coating for the accumulator in gray color. The casing for the rapid producer is made of sheet metal painted in glossy RAL 7047.
The product will arrive with electronic regulation already performed.
GENERAL TECHNICAL DATA
Specifications
- Maximum operating temperature: 85 °C
- Maximum operating pressure of the system: 3 bar
- Maximum operating pressure for sanitary: 6 bar
- Connections: Ø 3/4” M – 18mm (solar)
- Fluids: water – water/glycol mixtures (max 30%)
Materials
- Storage tank body: S235jr
- Insulation: EPS + PVC, Dens. 15 kg/m3, Thermal Cond. 0.030 W/mK
- Heat exchanger: AISI 316
- Pipes: Copper
- Hydraulic seals: EPDM
- Fittings: Brass UNI EN 12164 – CW614N
- Circulator: Cast Iron
AVERAGE WITHDRAWAL TIMES
DHW temperature = 40°C
Inlet water temperature = 15°C
|
Average storage temperature [°C] |
Storage return [°C] |
Withdrawal time with DHW flow rate 10 L/min ΔT25 |
| 55 | 20 | 66 |
| 50 | 20 | 56 |
| 45 | 20 | 46 |
| 80 | 20 | 116 |
| 70 | 20 | 96 |
| 60 | 20 | 76 |
TECHNICAL DATA
|
DESCRIPTION |
FWS500 |
|
Nominal flow rate for the primary storage [m3/h] |
3 |
|
Nominal DHW flow rate [L/min] |
40 |
|
Minimum DHW flow rate [L/min] |
2 |
|
DHW production (T1 = 55°C- ∆T2=10÷45*C) [L/min] |
44 |
|
Heat exchange power (T1 = 55°C- ∆T2=10÷45*C) [kW] |
107 |
|
DHW production (T1 = 60°C- ∆T2=10÷45*C) [L/min] |
53 |
|
Heat exchange power (T1 = 60°C- ∆T2=10÷45*C) [kW] |
130 |
|
DHW production (T1 = 65°C- ∆T2=10÷45*C) [L/min] |
60 |
|
Heat exchange power (T1 = 65°C- ∆T2=10÷45*C) [kW] |
146 |
|
Secondary DHW circuit pressure drop** [kPa] |
20 |
|
Max. ass. power [W] |
80 |
|
Primary circulator [-] |
Wilo PARA |
|
Primary circulator size |
15/8 |
|
Power supply [V] |
230 V AC 50/60 Hz |
|
Maximum operating temperature [°C] |
80 °C |
|
Max. op. pressure for the primary circuit |
3 bar |
|
Max. op. pressure for the secondary circuit |
6 bar |
|
Degree of Protection [-] |
IP 40 |
|
Diameter and type of hydraulic connections [-] |
G 3/4” ISO 228/1 |
|
DESCRIPTION |
FWS500 WITH SOLAR |
|
Surface [m2] |
2 |
|
Exchanger water capacity [L] |
12 |
|
Connection diameter [-] |
3/4” |
|
Pressure drop with flow rate 2 [m3/h] |
15 |
|
Heat exchange power ∆T20°C [kW] |
25 |
|
REF. |
DESCRIPTION |
Ø |
| 1 |
Cold water inlet |
3/4” M |
| 2 |
Hot water outlet |
3/4” M |
| 3 |
Circulation |
3/4” M |
| 4 |
Outlet from solar panel |
3/4” F |
| 5 |
Return to solar panel |
3/4” F |
|
REF. |
DESCRIPTION |
Ø |
| 1 |
Cold water inlet |
3/4” M |
| 2 |
Hot water outlet |
3/4” M |
| 3 |
Circulation |
3/4” M |
| 4 |
Outlet from solar panel |
3/4” F |
| 5 |
Return to solar panel |
3/4” F |
PRODUCT LIST
|
REF. |
DESCRIPTION |
CODE |
|
1 |
FWS 500 |
350101 |
|
2 |
FWS 500 WITH SOLAR |
350102 |
|
3 |
FWS 500 WITH CIRCULATION |
350103 |
|
4 |
FWS 500 WITH CIRCULATION AND SOLAR |
350104 |
