Embodied Carbon and Shower Heat Recovery for Architects

Tackling the Hidden Challenge: Embodied Carbon in Zypho WWHR for Zero‑Carbon Homes

Why Today’s Architects Can’t Ignore Embodied Carbon

You design high-performance, ultra-low operational-energy homes, only to discover the building services you specify, like MVHR units, cylinders, and pipes carry a heavy upfront carbon burden.

According to life cycle studies, embodied carbon can account for 40‑50% of total lifecycle emissions, especially in energy‑efficient buildings.

If you don’t address it early, your fabric-first design could still fail!

Zypho Waste Water Heat Recovery: An Embodied Carbon Opportunity

Zypho has worked hard to use materials most efficiently in all our products.

CO2

For the Zypho horizontal models, the embodied Carbon present (made chiefly from Copper and ABS moulded plastic) equates to:

  • For the iZi30 horizontal model ~15.2kg CO2
  • For the Slim50 horizontal model ~ 17.3kg CO2e

The Zypho vertical models, are manufactured from Stainless Steel with some Polypropylene mouldings:

  • For the PiPe65 vertical model ~ 59.8kg CO2e
  • For the PiPe75 vertical model ~ 65.8kg CO2e

“Payback”

As soon as the Zypho units go into operation in homes, all our products have a rapid payback in terms of CO2.

The Carbon saving will depend on how the hot water is made. With the assumptions that:

  1. making HW costs 0.25 kg CO2 / kWh heat,
  2. the average household is using 1500 kWh HW / year on showering

For the Horizontals

The iZi30 saves around 30% of this (ie: around 450 kWh / year. This equates to 113kg CO2 / year saving.

As such, the “Payback time” = 15.2 / 113 = 0.13 years (1.6 months)

The Slim50 saves around 1/2 of this (ie: around 750 kWh / year. This equates to 188kg CO2 / year saving.

As such, the “Payback time” = 17.3 / 188 = 0.092 years (1.1 months)

For the Verticals

The PiPe65 saves around 65% (ie: around 975 kWh / year = 244 kg CO2 / year saving.

“Payback time” = 59.8 / 244 = 0.25 years (2.9 months)

The PiPe75 saves around 75% (ie: around 1,125 kWh / year = 281 kg CO2 / year saving.

“Payback time” = 65.8 / 281 = 0.23 years (2.8 months)

What Zypho WWHR Means for Architects

  • Simple specification. Zypho systems integrate seamlessly with shower drainage and DHW.
    Compact units that require no additional plant space, no electrics, and fit neatly inside standard constructions.
  • Hit net-zero targets. Published CO2 data, shows that Zypho can help lower embodied carbon giving maximum renewable fabric performance whilst staying within carbon budgets.

Bottom Line: Act Early, Think Smart, Specify Zypho

Zypho’s WWHR systems allow you to achieve tangible reductions in both embodied and operational carbon, precisely aligning with the demands of SAP‑10.2, RIBA 2030 and BREEAM.

Environmental Product Declaration (EPD)

Finally, it is important to note from an Environmental Product Declaration (EPD) point of view that thanks to the passive operation of the Zypho unit, there is no running cost or emissions associated with operation.

Sources

  1. Embodied carbon is c.20% of UK built environment emissions; energy-efficient buildings may see 40‑50% lifecycle share Stroma+5UKGBC+5vbn.aau.dk+5
  2. UK government to enact embodied-carbon assessment mandates for >1,000 m² from 2025‑26 Stroma
  3. Industry shift towards whole-life carbon and supply-chain transparency (UKGBC, WorldGBC, ECHO) wikipedia.org+10UKGBC+10World Green Building Council+10

MORE ARTICLES