Solar Hot Water Retrofit Kit - 4 Flat Plat Collectors

Solar Hot Water Retrofit Kit - 4 Flat Plat Collectors


  Complete Retrofit Solar Heating Package SWHr-F4 4 x FPC 1200D Flat Panel Solar Collector Requires SIN or Tax ID for shipping to USA   Solar Water Heating Retrofit System   works with existing water tank for Moderate Clim Read More
  • Shipping Weight: 400kgs
  • Manufactured by: NLSS
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Complete Retrofit Solar Heating Package SWHr-F4

4 x FPC 1200D

Flat Panel Solar Collector

Requires SIN or Tax ID for shipping to USA


Solar Water Heating Retrofit System


works with existing water tank for

Moderate Climates


SRCC Certified for 30% Tax Credit


Complete solar heating package for domestic hot water for up to 8 people. These are the most advanced solar water heating kits on the market. Simple to install with no soldering or electrical wiring required. All kits come with every component you will need to successfully install your solar heating system. Includes items such as fill pump for quick pressurization and servicing of the heating system. All kits come standard with RESOL DeltaSol BS+ controller with two relays and includes advanced features such as holiday mode and energy monitoring.

Moderate-Warm Climates - This solar retrofit kit is designed for use year round including moderate climates.  The system will work up to 0°F and uses advanced solar heating fluid to protect against freezing.  An external plate heat exchanger is used to separate the energy from the solar loop and the potable water loop.  NOTE: For colder climate we suggest using package with solar vacuum tubes for better winter perfomance.

2nd Pump - Grundfos circ pump is provide for the water tank and cold water is moved through the heat exchanger gaining heat energy from the solar loop.  This allows for maximum heat transfer from the solar to the domestic hot water! 

DIY solar heating system's are designed to take the guess work out of solar heating. Modern day Flat Panel Collectors can reach temperatures exceeding 250°F, and as such proper sizing and installation is very important. All our kits have been engineered to provide the maximum performance will addressing all safety features.

Pre Heat or Direct - you can run the solar system off your main tank which is called "Direct".  However a two tank system where the first tank is preheated by the solar which then feeds to the main tank with back up heat is preferable as there is more mass for the solar to heat.  Because the pre-heat tank provides warm water to the main tank, very little energy is used and only when the main tank needs to bost the pre-heat water supply.  CAUTION - To avoid scalding a Water Tempering Valve should be installed on domestic hot water side as the supply can be hotter than the water tank's set temperature due to the solar.

solar water heating per-heat tank layout


  • 4 x SunRain FPC 1200D Vacuum tube collector
  • Pump Station with Wilo 3 speed pump and RESOL BS plus digital controller
  • 100 of Aurora Solar Flex  3/4" OD stainless steel piping, preinsulated and weather proof with sensor wire
  • all quick connect Aurora Flex Fittings for fast installation (no soldering)
  • pre-mixed ProSol LH-T high temp (475°F) solar heating fluid for vacuum tube collectors
  • positive displacement drill pump for filling and servicing
  • 24 liter (6.6g) Zilmet High Temp Solar Expansion tank - Specifically designed for solar heating
  • Caleffi Solar Air Vent - World's only Solar Auto Air Vent!
  • Stainless Steel Plate Heat Excahnger 1" fittings
  • Grundfos Alpha 2 15-55 pump for secondary heat exchanger side
  • Complete solar installation manual and free technical support


Design Layout

Solar flat plate water heating system


How to Modify Existing Tank - General

modified solar tank



Return Policy

We want you to be 100% satisfied with your purchase, if you are not, ship it back to us in the original packaging condition and we will refund your purchase less a 10% restocking fee, provided the equipment is received in good condition. Refund offer valid for 30 days from receipt of product.



We feel that being honest is a much better policy to win your trust rather than trying to lure you with nearly impossible statements such as life time warranty. Nothing lasts forever! Our warranty policy is simple; we offer a 3 year warranty on everything we sell and 10 years on our collectors. With this warranty you will get NO hassle next business day replacement (if shipping service and inventory permits). However, as a valued customer you will get technical support through the life time ownership of your product. Our Collector do carry longer warranties 10 years from the manufacture. The warranty cover failures that occur during normal operational conditions or manufactures defects. It does not cover failure due to inappropriate operation such as freezing or over heat. Damage caused by vandalism, storms, floods etc. Your household insurance should be modified to cover the system from such situations.


We accept PayPal and Credit card (Visa or Mastercard). If you are ordering multiple units and part, please call us to see if we can save you shipping cost for multiple item orders.




For complete solar kits please allow 2-3 weeks delivery. These kits are shipped via our preferred freight forwarder company and where possible we will schedule residential tailgate delivery (curbside). Heaters and accessories are usually in stock unless indicated otherwise. We do have expedited shipping services available for an additional fee. Please call us if you need a rush order. Once your order has been shipped you will be contacted via email and a tracking number will be provided.

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This product was added to our catalog on Friday 25 May, 2018.