
12-H30 Comparison
| photo | price | summary | rating |
|---|---|---|---|
![]() | $33.99 | Condition is New, BackStop 12-H30 Hydronic Heating Thermal Expansion 4.5 gal Safety Tank, shipping cost = $27.80 | 99.7% |

The Backstop 12-H30 Hydronic Heating Thermal Expansion 4.5 Gal Safety Tank is an essential component for any hydronic heating system, designed to provide additional safety and protection against the damaging effects of thermal expansion. This tank is engineered to hold 4.5 gallons (17.03 liters) of water, making it an ideal solution for smaller to medium-sized heating systems.
The Backstop 12-H30 tank is constructed of high-quality materials, including a durable, corrosion-resistant steel shell, and a heavy-duty, reinforced glass-lined interior. This design not only ensures long-lasting durability but also provides excellent resistance to thermal shock and corrosion, which can be common issues in hydronic heating systems.
One of the key features of this safety tank is its ability to accommodate thermal expansion. As water heats up, it expands, and if not properly accounted for, this expansion can put undue stress on the system and potentially cause damage. The Backstop 12-H30 tank is specifically designed to provide a safe and reliable space for this expansion to occur, helping to protect your hydronic heating system from costly repairs.
The Backstop 12-H30 Hydronic Heating Thermal Expansion Tank also comes equipped with a factory-installed, high-quality, diaphragm-type expansion vessel. This vessel is designed to flex as the water inside expands, allowing the tank to maintain an even water level and preventing damage to the system caused by excessive pressure.
Installation of the Backstop 12-H30 tank is straightforward and can typically be completed by a qualified plumber or heating professional. The tank features threaded inlets and outlets, allowing for easy connection to the hydronic heating system. Additionally, the tank comes with a factory-installed pressure relief valve, which ensures safe operation by automatically releasing excess pressure if necessary.
In summary, the Backstop 12-H30 Hydronic Heating Thermal Expansion 4.5 Gal Safety Tank is an essential accessory for any hydronic heating system. Its durable design, ability to accommodate thermal expansion, and ease of installation make it a valuable investment for both home and commercial applications. By protecting against the damaging effects of thermal expansion, this tank helps ensure the long-term reliability and efficiency of your hydronic heating system.
Hydronic heating systems use water to transfer heat throughout a building. A thermal expansion tank, such as the Backstop 12-h30 model with a 4.5-gallon capacity, is an essential component of these systems. This tank helps manage pressure changes caused by thermal expansion, ensuring the overall system's efficiency and longevity. Here are some pros and cons of investing in a Backstop 12-h30 hydronic heating thermal expansion safety tank:
Pros:1. Enhances System Efficiency: The thermal expansion tank reduces pressure buildup, ensuring the hydronic heating system functions optimally.
2. Protects System Components: By accommodating the water expansion caused by heating, the tank safeguards the system's pipes, boiler, and other components from damage.
3. Compatibility: The Backstop 12-h30 tank is compatible with various hydronic heating systems, making it a versatile choice for different applications.
4. Safety: The safety tank contains an air bubble to prevent the system from overpressurizing, which could potentially lead to leaks or damage.
Cons:1. Cost: While essential, the cost of a thermal expansion tank can be a significant investment, especially for larger systems.
2. Maintenance: The tank requires periodic inspection and maintenance to ensure proper function and avoid potential issues.
3. Space Requirement: The tank's physical size may require additional space in the heating system installation area.
In conclusion, a Backstop 12-h30 hydronic heating thermal expansion safety tank offers numerous advantages, including enhanced system efficiency, protection of components, compatibility, and safety. However, its cost, maintenance requirements, and space demands are important considerations. Despite these cons, the benefits of a thermal expansion tank often outweigh the drawbacks, making it a worthwhile investment for hydronic heating system owners.
Recommendation:If you have a hydronic heating system, we recommend investing in a thermal expansion tank, such as the Backstop 12-h30 model, to ensure its optimal performance and longevity. Regular maintenance and proper installation will help mitigate the costs and space requirements while maximizing the benefits.
Details:
Technical specifications according to manufacturer data from Backstop and mid-city, the 12-H30 features: volume: 4.5 gallons sometimes listed as 4.8 by certain merchants. Connection: 1/2 not male system connection made of carbon steel. It functions by absorbing expanded water volume to keep system pressure safely below relief valve settings, preventing stress on boiler components. Dimensions: approximately 15 inches in height and 11 diameter.
Backstop 12-H30 hydronic heating thermal expansion 4.5 gal safety tank, the is a 4.5-gallon thermal expansion tank specifically designed for closed-loop hydronic heating and cooling systems. Construction: features a cold-rolled carbon steel shell with heavy-duty butyl rubber diaphragm and triple-layer electrostatic silver painted finish. Some exceptions may apply.
specifications maxohvac:
- brand: Backstop
- mpn: 12-h30
- model: Backstop-12-h30-hydronic
- part type: Expansion Tank
- country of origin: United States
- location: Trailer 1 Shelf I1
- upc: 036978120105
payments maxohvac:
- other
- wallet: paypal
- credit card: diners-club
shipping maxohvac:
- carrier: usps, fedex
- class: standard
- transit: 3-8 days
- service: usps ground advantage, fedex ground / fedex home delivery
- type: calculated
offer maxohvac:
- price: $33.99
- item condition: New
- availability: in stock
- sold #: 8
- in stock #: 1
- started: february 25, 2026
- options: ship-to-home
- best offers: true
general maxohvac:
- category: Business & Industrial > Hvac Refrigeration
returns maxohvac:
- paid by: buyer
- policy: returns accepted
- time: 30 days
- method: money back
seller maxohvac:
- rating: 99.8%
- city: eldon, missouri
- # reviews: 8640
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