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ThinTanks Slimline Rainwater Systems

Space‑saving rainwater storage for tight PNW sites.

Product Water designs and installs ThinTanks “water‑wall” systems along fences, walls, and setbacks—so you capture more rainwater without giving up usable space.

  • Ideal for side yards, alleys, and fence‑lines where round tanks won’t fit.
  • Integrated with our non‑vertical, hydraulic collection approach for higher performance.
  • Designed for Western Washington roofs, soils, and freeze conditions.
Schedule a ThinTanks consult See how the system works

Serving Seattle, Tacoma, and Western Washington homeowners.

ThinTanks + Product Water = space‑efficient, code‑aware rainwater design.

What is a ThinTank?

ThinTanks are ultra‑slim polyethylene rainwater tanks that create a “water wall” along fences and walls, giving you serious storage in sites where traditional round tanks simply won’t fit.

  • Designed to sit tight to fences, walls, and setbacks in urban and suburban PNW sites.
  • Available in multiple slim capacities that can be linked together for more storage.
  • Perfect for side yards, driveways, and narrow passages where space is at a premium.
  • Compatible with Product Water’s non‑vertical, hydraulic collection strategies.

Why they’re different

Instead of a big round tank dominating your yard, ThinTanks hug the edge of your property line—turning a fence or wall into a functional water‑storage surface.

Key features for tight PNW sites

ThinTanks combine a slim, architectural “water wall” form with serious capacity. Product Water designs these tanks into your site so they work with your space, not against it.

Ultra‑slim footprint

At only a foot or so thick, ThinTanks sit along fences, walls, or setbacks—freeing up patios, play areas, and planting beds that bulky round tanks would consume.

Scalable storage

Multiple ThinTanks can be linked in series, giving you more gallons without increasing the footprint, ideal for driveways, side yards, and multifamily projects.

PNW‑ready design

Built from durable, UV‑stable polyethylene and installed with PNW‑appropriate overflows, freeze‑aware plumbing, and safe discharge locations.

System‑first integration

Product Water pairs ThinTanks with non‑vertical, hydraulic collection and distribution so each gallon captured can actually be used where and when you need it.

How ThinTanks fit Western Washington sites

From tight side yards in Seattle to ADUs and small multifamily projects across the South Sound, ThinTanks let you add meaningful storage where space and setbacks are working against you.

Homes, gardens, and side yards

Capture roof runoff along your fence line and use it to irrigate gardens, raised beds, and landscapes—without losing patio space or access paths to a big round tank.

  • Single‑family homes with narrow side yards or long eaves.
  • Front or back yard gardens where aesthetics matter.
  • Retrofitting existing homes that don’t have obvious tank locations.

ADUs, infill, and small multifamily

For tight urban projects, ThinTanks can live along driveways, alleys, or shared walls, supporting rainwater reuse or helping address project‑specific stormwater needs.

  • Accessory dwelling units with limited yard space.
  • Townhomes and rowhouses sharing narrow courtyards.
  • Design‑driven projects that want clean, integrated storage.

Resilience and backup water

Use ThinTanks as non‑potable backup for outages, smoke events, or summer water restrictions so landscapes can survive and essential outdoor uses can continue.

  • Backup supply for gardens and critical plantings.
  • Non‑potable outdoor uses during restrictions or outages.
  • Part of broader resilience and emergency‑preparedness planning.

How the ThinTanks process works

A clear, four‑step path from first questions to a working ThinTanks system that fits your site, your budget, and the way you actually use water.

1

Share your site

Send your address, a few photos, and how you’d like to use ThinTanks. We review roof area, setbacks, access, and any obvious constraints.

2

Concept & ballpark budget

We outline a ThinTanks layout, estimated storage, and a ballpark installed budget so you can decide whether to move forward.

3

Install & integration

We install ThinTanks, connect them to your roof and drains, and integrate with outlets or irrigation so captured water is easy to use.

4

Walk‑through & support

We walk you through valves, seasonal use, and basic maintenance, and remain available for questions as you live with the system.

Tell us about your ThinTanks project

Share a few details about your site and how you hope to use ThinTanks. We’ll review roof area, space, and access, then follow up with a concept and ballpark budget.

  • Best for projects in Seattle, Tacoma, and Western Washington.
  • Ideal for sites with tight side yards, driveways, or fence‑line opportunities.
  • You can attach photos or a sketch to help us understand your layout.

Prefer to start by phone? Call us and mention you’re asking about ThinTanks so we can pull up this page while we talk.