Unvented Cylinders
Unvented Cylinders
Solfex are proud to offer a complete range of unvented stainless steel cylinders specifically for heat pump applications providing mains pressure domestic hot water. Utilising an already well established stainless steel unvented hot water cylinder, this product has been developed to maximise the lower temperatures available from the heat pump. The heat exchanger is a totally new design. It consists of a multi-pass corrugated stainless steel tube in parallel to reduce the pressure loss whilst maximising the heat exchange. Many medium to large heat pumps need heat exchangers in the store that will cope with the higher flow rates associated with primary temperatures that are typically 50˚C or 60˚C. Due to the fact that many heat pumps will not raise the stored water temperature to 60˚C, which is necessary to prevent the growth of legionella, the SOLHP range of cylinders are supplied with an immersion heater and a thermostat.
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Corrugated Stainless Steel CoilSOLHP cylinders use a high heat transfer corrugated tube heat exchanger to give a 20% faster recovery than plain tube. It is also lighter and stronger than plain tube making the vessel the lightest and easiest to handle on site.
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Quality StandardAll SOLHP cylinders are manufactured in accordance with BS EN 12897 the specification for unvented water storage vessels. The cylinders have been tested by NSF-WRc and WRAS, and found to comply with Building Regulations G3 and In performance, it complies with the requirements of BS EN 806-1 to 5 and meets the NHBC criteria for domestic properties. Our manufacturing partner also operates a quality management system audited and accepted by the BSI in accordance with BS EN ISO 9001:2008. Special features
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SOLHP 180 |
SOLHP 210 |
SOLHP 250 |
SOLHP 300 |
SOLHP 400 |
SOLHP 180SLIM |
SOLHP 210SLIM |
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Capacity - Total Volume | l | 180 | 210 | 250 | 300 | 400 | 180 | 210 |
Dedicated Solar Volume | l | 65 | 75 | 90 | 105 | 130 | - | - |
Standing Heat Loss Rate | kWh/24h | 1.48 | 1.7 | 1.85 | 2.04 | 2.82 | 2.01 | 2.23 |
Weight (empty) | kg | 33 | 38 | 43 | 49 | 61 | 33 | 37 |
Weight (full) |
kg | 213 | 248 | 293 | 349 | 461 | 213 | 247 |
Pressure Regulating Valve Setting | Bar | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
Expansion Relief Valve Setting | Bar | 4.75 | 4.75 | 4.75 | 4.75 | 4.75 | 4.75 | 4.75 |
Temp Setting (P&T valve) |
°C | 95 | 95 | 95 | 95 | 95 | 95 | 95 |
Pressure Setting (P&T valve) | Bar | 6 | 6 | 6 | 6 | 6 | 6 | 6 |
Expansion Vessel Size (volume) | l | 18 | 24 | 24 | 35 | 2 x 24 | 18 | 24 |
Expansion Vessel initial charge pressure | Bar | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
Height | mm | 1305 | 1495 | 1745 | 1991 | 2030 | 1790 | 1970 |
Diameter | mm | 550 | 550 | 550 | 550 | 550 | 550 | 550 |
Surface Area of Solar Heating Coil | m2 | 0.68 | 0.68 | 0.97 | 0.97 | 1.27 | - | - |
Solar Coil pressure loss* | Bar | 0.191 | 0.191 | 0.241 | 0.241 | 0.31 | - | - |
Heat Pump Coil Surface Area | m2 | 1.36 | 1.56 | 1.94 | 2.04 | 2.91 | 3.01 | 3.01 |
Heat Pump Coil Thermal rating* | kW | 24.3 | 26.2 | 27.5 | 34.2 | 47.2 | 32.8 | 31.2 |
Heat Pump coil pressure loss* | Bar | 0.048 | 0.054 | 0.06 | 0.019 | 0.027 | 0.018 | 0.018 |
* Measured at 151lpm primary flow rate
Model Selection Guide | |
Number of Bedrooms in Property | Model |
1 | SOLHP180 |
2 | SOLHP210 |
3 | SOLHP250 |
4 | SOLHP300 |
5 | SOLHP400 |
6 | SOLHP400 |
Unvented Cylinders
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