Skip to content
Shop Your Local Store ● Ship to Your Hometown Store
Pro & Contractor Accounts ● Apply for Net Terms
100,000+ Products ● Trusted Authentic Brands
FAQ Shipping & Returns Order Lookup Contact Account
Reliance Water Systems 20 gal Pre-Charged Horizontal Well Tank
Reliance Water Systems 20 gal Pre-Charged Horizontal Well Tank
Reliance Water Systems 20 gal Pre-Charged Horizontal Well Tank
Reliance Water Systems 20 gal Pre-Charged Horizontal Well Tank
Reliance Water Systems 20 gal Pre-Charged Horizontal Well Tank
Reliance Water Systems 20 gal Pre-Charged Horizontal Well Tank

Reliance Water Systems 20 gal Pre-Charged Horizontal Well Tank

Made in America

Support American manufacturers + independent hardware retailers in one purchase.

Lays flat to fit tight crawl spaces while its epoxy-lined steel tank cuts down on pump cycling.
Reliance Water Systems MPN PMDH-20
Sold Locally Only

This product isn’t sold on our website — see your local hardware store.

In-Store Exclusive

This one's worth the trip to the store.

This Reliance Water Systems item is one you'll find in stores rather than online — and that's often the better way to buy. In store you get the genuine article, full manufacturer warranty, and real advice from someone who's actually handled it — no counterfeits, no gray-market resellers.

  • Authorized dealer network · Full manufacturer warranty & support
  • Guaranteed authentic · No counterfeits, no gray-market resellers
  • The brands set these standards · Be wary of sellers who don't follow them
Why isn't this online? The whole story →

About Product Overview

When a well pump has to fight a low-clearance space, a horizontal tank solves the problem a standard vertical tank can't. The Reliance PMDH-20 lays flat, tucking under floor joists or into crawl spaces where headroom is tight, while still giving your system the pre-charged air cushion it needs to cut down on pump cycling.

Built from steel with an epoxy lining, this 20-gallon tank resists corrosion from the inside out, which matters since well water sits in it around the clock. The 1-inch MPT male connection makes hookup straightforward, and the pre-charge means less start-stop wear on your pump motor, which can extend its service life. Rated to handle water up to 120°F, it's suited for typical residential well setups. Anyone replacing an old tank in a basement, crawl space, or utility closet with limited overhead clearance will find this a practical fit.

  • Capacity: 20 gallons
  • Connection: 1-inch MPT (male)
  • Construction: Steel tank with epoxy lining
  • Orientation: Horizontal, pre-charged
  • Max temperature: 120°F
  • Dimensions: 27.125" W x 15.375" D x 17.375" H

The Details Specifications

Ships Ground Travels by ground for safe handling — common for items with a lithium battery, aerosol, or liquid inside. Nothing extra to do on your end; it simply ships by truck instead of by air.
Non-Returnable This product cannot be returned. All sales final.
Brand Reliance Water Systems
Model / MPN PMDH-20
UPC 091194013587
Weight 30 lbs
Country of Origin USA
Safety Data Sheet (SDS) Manufacturer documentation · opens in new tab
Shop Local · Support Independent

Every order helps keep your local hardware store on the corner.

Why we built NHG
You might find it for less locally. Independent retailers often offer competitive pricing — some products are even cheaper in-store than online.
Real expert advice — not search results. Independent hardware staff know their inventory and the local conditions you're working in.
Keep the neighborhood working. Every dollar spent at an independent retailer returns roughly 3x more to your local economy than at a national chain.

Ask our counter. Or theirs.

Most hardware stores can do more than you think. If we can't help you, the folks down the street probably can — just ask at the counter.

What we offer
Shop Your Local Store Ship to your hometown store
Pro & Gov Accounts Net terms · tax-exempt
Ships Nationwide Direct to your door
Shop Local First Real hardware stores
$0.68 of every dollar spent at a local independent business stays in the community. At a national chain, it's about fifteen cents. Civic Economics, multi-city retail studies
100% Authorized & Genuine — Our Guarantee →
Their Counter
Try local first · we'll wait

The stores we send you to are local and independently run — often for generations, the kind of place where someone behind the counter knows the regulars. We don't own them. We just think they deserve the foot traffic. They can put most of what we sell on their next truck. Ask there before you check out here.

Find a local store →
Mon–Fri 6–5 PST
Independent hardware retailer? Join the network → Make hardware content? Earn 6% as a creator →
About our directory. National Hardware Group is an independent retailer and directory. The local stores we list and link to are separately owned and operated — we have no ownership stake in any of them, and most pay us nothing to be included. That includes plenty of stores flying a familiar banner that people don't realize are locally owned and run, not operated by a corporation. Store owners can choose to upgrade their listing for an enhanced presence or pickup features, but the base directory is free, and inclusion is never a paid endorsement.

Compare products

{"one"=>"Select 2 or 3 items to compare", "other"=>"{{ count }} of 3 items selected"}

Select first item to compare

Select second item to compare

Select third item to compare

Compare