Photo Sources
Wet Return's photos come from Wikimedia Commons; below, each one is listed with the photographer named on its file page, its license and a link to the original.
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Photos
Photos shared under Creative Commons Attribution (CC BY) or Attribution-ShareAlike (CC BY-SA). Every one was cropped to a 3:2 frame, resized and saved as WebP for this site; on three boiler-room photos, small printed maker names or labels were blurred, and one outdoor-unit photo was trimmed at the edge to leave its label out. Those changes are Wet Return's, not the photographers'.
- Automatic air vent: by The RedBurn, CC BY-SA 4.0 (license terms); file on Wikimedia Commons
- Black cast-iron radiator: by BunkieBuilder, CC BY-SA 4.0 (license terms); file on Wikimedia Commons
- Boiler service with a flue-gas analyser: by Mehlauge, CC BY-SA 4.0 (license terms); file on Wikimedia Commons
- Brick chimney: by Turquis Oana, CC BY 3.0 (license terms); file on Wikimedia Commons
- Brownstone row houses in winter: by Mike Goren, CC BY 2.0 (license terms); file on Wikimedia Commons
- Carbon monoxide alarm: by Donald Trung Quoc Don, CC BY-SA 4.0 (license terms); file on Wikimedia Commons
- Cast-iron column radiator under a window: by Schorle, CC BY-SA 4.0 (license terms); file on Wikimedia Commons
- Combi boiler with its cover off: by Chixoy, CC BY-SA 3.0 (license terms); file on Wikimedia Commons
- Diaphragm expansion tanks: by Stefan Thiesen, CC BY-SA 3.0 (license terms); file on Wikimedia Commons
- Ductless mini-split indoor unit: by Dr.cueppers, CC BY 3.0 (license terms); file on Wikimedia Commons
- Gauge glass and brass valves on a boiler: by James Petts from London, England, CC BY-SA 2.0 (license terms); file on Wikimedia Commons
- Heat pump outdoor unit in snow: by PeterEastern, CC BY-SA 4.0 (license terms); file on Wikimedia Commons
- Old brick terraces with chimneys: by John Seb, CC BY-SA 2.0 (license terms); file on Wikimedia Commons
- Old radiator valve: by Affemitwaffe, CC BY-SA 3.0 (license terms); file on Wikimedia Commons
- One-pipe steam radiator with valve and vent: by Becky Stern from Brooklyn, USA, CC BY-SA 2.0 (license terms); file on Wikimedia Commons
- Radiator with its valve: by oaktree_brian_1976 from Canada, CC BY 2.0 (license terms); file on Wikimedia Commons
- Radiators of different sizes: by Gennady Grachev from Moscow, Russia, CC BY 2.0 (license terms); file on Wikimedia Commons
- Wall-hung gas boiler: by The RedBurn, CC BY-SA 4.0 (license terms); file on Wikimedia Commons
Public domain or CC0 (no credit required, listed anyway):
- Long cast-iron radiator: CC0, by Warren LeMay from Cincinnati, OH, United States; file on Wikimedia Commons
- Mini-split outdoor unit: CC0, by Wikideas1; file on Wikimedia Commons
- Ornate metal radiator cover: Public domain, by Maggie Jones; file on Wikimedia Commons
- Radiator bleed key: CC0, by Nicbou; file on Wikimedia Commons
Illustrations and charts
Pictures captioned "Illustration" were generated for Wet Return in one engraved, trade-catalogue style and show no real product. The numbered infographics on each page were also generated for this site; every word and number on them repeats a figure from that page's text, with the source named on the page.