The best solar we have made so far!
You want the Mark 4 especially if:
- You care about both performance and aesthetics in what you buy
- You want a solar that really stands the test of time
- You want the lowest possible cost for every hot bath you take
Collector
- Active Surface: 1.92
- Absorber: high selective (TiNOX) with copper hydroskeleton
- Absorber welding: ultrasonic
- Absorbency: a>95%
- Thermal emission: e<5% Frame: anodized double-wall aluminium Insulation: mineral wool Insulation: tempered 3.2mm (safety), low-iron (permeability>91.5%)
- Efficiency: 81% (according to tests at Tuv Rheinland)
- Certifications:Solar-Keymark, SRCC
Tank
- Capacity: 156.2lt
- Internal tank design: by Interdomo (large lid depth and internal seams for perfect plating
- Tank/jacket material: 2.5mm DC-03 steel / 1.5MM DC-03 steel (according to DIN 10130)
- Welding method/check: robotic/double check, before and after coating, at 15bar
- Corrosion protection: direct enameling (according to DIN 4753/3)
- Cathodic protection: magnesium rod (according to DIN 4753/6)
- Antifreeze protection: antifreeze & anticorrosive liquid Calpak Nox (propylene glycol)
Insulation: expanded ecological polyurethane (43 kg/m3) 45m thick
Included accessories: resistor 3,5kw inox, check valve (heavy duty), safety lock
Certifications: Email (enamel quality) ROHS (hygiene)
Tank connection set: multilayer pipes Φ20 (in 3/4″ sockets) and Isopipe insulation
Connection to boiler: triple energy (trien) models only
Base: entirely made of aluminium
