Calpak Mark 5 Solar Water Heaters

The Calpak Mark 5 Solar Water Heater (Indirect / Closed Loop System) is a high-performance solar thermal solution engineered for reliable hot water production in residential properties with increased daily consumption.

Designed with a robust European-standard tank and a high-efficiency solar collector, this system ensures consistent hot water supply while offering strong protection against corrosion, scaling, and freezing — making it ideal for Tanzania’s diverse climates, including coastal, highland, and mineral-rich water regions.

Features & Benefits

• Indirect Closed-Loop System : Uses anti-freeze glycol fluid instead of direct water circulation, preventing scale build-up and extending system lifespan, especially in hard water areas of Tanzania.
• High-Efficiency 2.09 m² Solar Collector : Large absorber surface with low-iron tempered glass (>91.5% transparency) maximises solar heat capture for faster and more efficient water heating.
• 151 Litre Enamel-Coated Tank : Manufactured according to DIN 4753 standards with premium enamelling, providing superior corrosion resistance and long-term durability.
• Magnesium Anode Protection : Offers additional cathodic protection, significantly reducing internal tank corrosion and maintenance costs.
• 50mm High-Density PU Insulation : Minimises overnight heat loss, ensuring hot water availability even in early mornings or cooler regions.
• 3.5kW Electric Backup Heater : Guarantees hot water supply during cloudy days or periods of high demand.
• Heavy-Duty Aluminium Collector Frame : Corrosion-resistant structure designed to withstand coastal humidity and harsh weather conditions.
• 316L Stainless Steel Flexible Pipes : Premium-grade insulated connections that resist rust, pressure, and long-term wear.
• Integrated Safety & Non-Return Valves : Enhances operational safety while protecting the system from pressure fluctuations.
• Aluminium / Galvanised Steel Roof Mounting Kit : Suitable for both flat and inclined roofs, ensuring stable and secure installation.

Use Cases

• Residential Family Homes : Ideal for households with medium to high hot water consumption for bathrooms, kitchens, and laundry use.
• Villas & Gated Communities : Provides reliable and energy-efficient hot water solutions for modern residential developments.
• Coastal Properties (e.g., Dar es Salaam) : Corrosion-resistant components perform well in humid and salty environments.
• Homes Using Borehole or Hard Water : Indirect closed-loop system prevents scaling in collectors, making it perfect for mineral-rich water areas.
• Rural Homes with Unstable Electricity : Reduces dependence on grid power while the electric backup ensures hot water availability when needed.
• Guest Houses & Small Lodges : Cost-effective hot water solution for hospitality businesses aiming to lower electricity expenses.
• Energy-Conscious Households : Suitable for homeowners looking to reduce electricity bills and adopt renewable energy solutions.
• New Construction Projects : Recommended for developers integrating solar thermal systems into eco-friendly building designs.

Value Propositions

• Significant Electricity Savings : Reduces reliance on grid power, helping households in Tanzania cut water-heating electricity costs by up to 70:80%.
• Long-Term Investment Protection : Indirect closed-loop design and dual corrosion protection (enamel coating + magnesium anode) extend system lifespan and reduce replacement costs.
• Built for Hard Water Conditions : Prevents scale build-up in collectors, making it ideal for borehole and mineral-rich water areas.
• Reliable Year-Round Performance : Anti-freeze glycol system ensures consistent operation in cooler regions, while the 3.5kW electric backup guarantees hot water even during cloudy days.
• Premium European Engineering : Manufactured to DIN standards, offering higher durability and performance compared to many entry-level solar heaters in the market.
• Low Maintenance Requirements : Reduced scaling and corrosion mean fewer service interventions and lower maintenance expenses over time.
• Environmentally Responsible Choice : Uses renewable solar energy and CFC-free insulation, supporting sustainable living and reduced carbon footprint.
• Strong ROI for Homes & Hospitality : Ideal for homeowners, lodges, and developers seeking long-term operational savings and increased property value.

Local Market Positioning in Tanzania

• Premium Solar Water Heating Solution : Positioned above basic direct systems, targeting customers who value long-term performance and durability.
• Best Fit for Urban & Peri-Urban Homes : Ideal for Dar es Salaam, Arusha, Mwanza, Dodoma, and other cities where electricity tariffs are high and hot water demand is consistent.
• Strong Value for Coastal Regions : Aluminium and stainless steel components resist corrosion from salty sea air — a key advantage for properties in Tanga, Bagamoyo, and Zanzibar.
• Suitable for Areas with Hard or Borehole Water : Indirect closed-loop design prevents scaling, reducing service calls and enhancing reliability in regions like Manyara and Morogoro.
• Attractive to Eco-Conscious Consumers : Solar-first approach appeals to homeowners wanting to reduce carbon footprint and reliance on TANESCO.
• Preferred by Developers & Architects : Recommended for residential projects, gated communities, and new housing developments with premium fittings.
• Reliable Backup for Unstable Grids : Built-in electric immersion heater ensures hot water even when grid power is inconsistent — a common situation in rural and some urban Tanzanian areas.
• Competitive Edge for Hospitality Sector : Lodges, guest houses, and boutique hotels benefit from reduced operational costs and enhanced guest comfort.

Technical Specification