Thermann  315L Electric Solar - Bottom Element
  • 10


    Cylinder Warranty
  • 15


    Tubes & Manifold Warranty



Thermann Evacuated Tube Solar electric boosted hot water systems offer the best of both worlds. While the tubes harness the suns energy to heat your water, you also have the confidence of an affordable electric tank to provide back up if needed. You’ll not only have peace of mind, you’ll also reduce your running costs.

  • Leading industry warranties
  • Innovative technology
  • Lightweight systems- Heavy lifting not required
  • Energy efficient
  • Cyclone rated framework
  • Cost effective to run

Prices are inclusive of GST

Must be installed by a licensed plumber.

The Tubes

Step 1

The sunlight strikes the dark absorber coating inside the evacuated tube.

Step 2

The heat pipe transfers the heat up to the copper header pipe location in the insulated manifold box.

Step 3

A circulator moves water from the storage tank to the copper pipe warming the water. The solar heated water is then pushed down into the storage tank for use. Anti-frost is built in to the Thermann system to ensure solar hot water can be provided even in cold regions.

how it works 1

Passive Sun Tracking

The round tube design of the Thermann system passively tracks the sun throughout the day giving the highest possible performance from early morning through to late afternoon.

how it works 2

System Set Up

how it works 3
No. People 3-5 4-6 5-9
No. Tubes 22 30 44

Electric Boosted Tank

Measurements (mm)250L BOT315L BOT315L MID400L BOT400L MID
Tank diameter (A) 617 617 617 705 705
Tank height (B) 1445 1765 1765 1704 1704
HW outlet 1211 1531 1531 1445 1445
PTRV port 1211 1531 1531 1445 1445
Top sensor port 786 872 872 809 832
Solar return port 567 566 504 536 554
Bottom sensor 347 355 326 340 357
Solar Flow 197 197 197 219 219
Cold Water Inlet 197 197 197 219 219
Dry Weight (kg) 71 92 92 116 116

Specifications correct for units manufactured after 1st August 2016 (including some manufactured prior to this date). 

Roof Collector

Measurements (mm)Dry Weight
Collector Width (A) Length (B) WO/Tubes W/Tubes
22 Tubes 1636 2005 20kg 80.7kg
30 Tubes 2196 2005 24kg 105.7kg

Dry weights based on 2 track flush mount frame.

ResizedImage258470 electric evacuated tube tank tech drawingResizedImage407301 electric evacuated tube roof collector tech

Solar Savings Later

When it comes to lowering your power bills, Thermann is the right investment choice for the longer term. When paired with the solar tube components, it provides lower running costs, making it the smarter, more sustainable and affordable alternative to the traditional systems. It’s also better for the environment.

solar ready process

When choosing a hot water system, there are a number of factors you need to consider beyond the unit price. Installation costs can vary greatly for different types of hot water units. Ongoing running costs should also play a part in your purchase decision.

running cost chart

Guide only based on current average energy cost. This chart does not account for increased Electricity or Gas costs in coming years.

Where to Buy

Thermann hot water systems are available exclusively through Reece Plumbing. Find your nearest branch by entering your postcode below.

(You will be taken to the Reece website)


Here are the most common questions we get asked about hot water.

Get in Touch

Want to find out more about any of the hot water systems in the Thermann range? We’re happy to help.