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    <title>Anti Freeze Valves from MacDonald Plumbing &amp; Heating Supplies</title>
    <link>http://www.macdonaldplumbingsupplies.com/rss/1/productlistings/anti-freeze-valves/cat685</link>
    <description>&lt;p class=&quot;PDq2pG_selectionAnchorContainer&quot; dir=&quot;auto&quot; data-start=&quot;661&quot; data-end=&quot;1064&quot;&gt;The &lt;strong data-start=&quot;665&quot; data-end=&quot;687&quot;&gt;Anti Freeze Valves&lt;/strong&gt; department at MacDonald Plumbing Supplies provides specialist components designed to help protect heat pump systems from potential damage caused by freezing temperatures. With heat pump installations increasingly using external pipework, protecting water filled circuits during periods of very cold weather is an important consideration when designing and installing a system.&lt;span class=&quot;PDq2pG_selectionAnchor&quot;&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p dir=&quot;auto&quot; data-start=&quot;1066&quot; data-end=&quot;1494&quot;&gt;Anti freeze valves are designed to provide automatic protection when the temperature around the valve reaches its specified operating point. The valve can allow water to drain from the system, helping to reduce the possibility of water freezing within exposed pipework and causing damage to components. Once installed correctly, this provides an additional layer of protection for suitable heat pump systems during cold weather.&lt;/p&gt;
&lt;p dir=&quot;auto&quot; data-start=&quot;1496&quot; data-end=&quot;1870&quot;&gt;Our &lt;strong data-start=&quot;1500&quot; data-end=&quot;1522&quot;&gt;Anti Freeze Valves&lt;/strong&gt; are particularly relevant to professional heating engineers and heat pump installers who need practical solutions for protecting systems against low temperatures. They can be considered as part of the overall installation design alongside suitable insulation, system controls and other measures intended to protect external pipework and equipment.&lt;/p&gt;
&lt;p dir=&quot;auto&quot; data-start=&quot;1872&quot; data-end=&quot;2176&quot;&gt;Correct positioning and installation are important to ensure an anti freeze valve can operate as intended. Installers should always follow the manufacturer&#039;s installation instructions and check that the valve is suitable for the particular heat pump system, pipework arrangement and operating conditions.&lt;/p&gt;
&lt;p dir=&quot;auto&quot; data-start=&quot;2178&quot; data-end=&quot;2537&quot;&gt;The &lt;strong data-start=&quot;2182&quot; data-end=&quot;2204&quot;&gt;Anti Freeze Valves&lt;/strong&gt; range provides a straightforward solution for installers looking to incorporate automatic freeze protection into appropriate heat pump installations. By helping to reduce the risk associated with freezing water, these valves can contribute to the protection and reliability of external heating system pipework during colder weather.&lt;/p&gt;
&lt;p dir=&quot;auto&quot; data-start=&quot;2539&quot; data-end=&quot;2783&quot;&gt;Whether you are installing a new air source heat pump system, carrying out an upgrade or replacing an existing protection component, MacDonald Plumbing Supplies offers practical products for professional heating and renewable energy installers.&lt;/p&gt;</description>
    <copyright>Copyright 2026 MacDonald Plumbing &amp; Heating Supplies</copyright>
    <language>en</language>
    <lastBuildDate>Fri, 09 Oct 2026 02:05:05 +0100</lastBuildDate>
    <pubDate>Fri, 09 Oct 2026 02:05:05 +0100</pubDate>
              <item>
              <pubDate>Fri, 09 Oct 2026 02:05:05 +0100</pubDate>
              <title>Inta 28mm Anti-Freeze Valve ZERO28</title>
              <description><a href="/heat-pumps-accessories-c682/anti-freeze-valves-c685/inta-28mm-anti-freeze-valve-zero28-p16592"><img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-src="https://www.macdonaldplumbingsupplies.com/images/products/thumbnails/1670232713-74485300.png" alt="Inta 28mm Anti-Freeze Valve ZERO28"  class="lazyload" /></a>
<p><a href="/heat-pumps-accessories-c682/anti-freeze-valves-c685/inta-28mm-anti-freeze-valve-zero28-p16592">Inta 28mm Anti-Freeze Valve ZERO28</a></p>
<p>Operation

The Inta Zero is a unique antifreeze valve designed and engineered to protect heat pump systems that are operating with water.
Designed to discharge when the system water temperature drops to 3°C, preventing ice from forming in the heat pump circuit that could cause breakdown or costly damage to the system.
</p></description>
              <guid>/heat-pumps-accessories-c682/anti-freeze-valves-c685/inta-28mm-anti-freeze-valve-zero28-p16592</guid>
              <link>/heat-pumps-accessories-c682/anti-freeze-valves-c685/inta-28mm-anti-freeze-valve-zero28-p16592</link>
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          <item>
              <pubDate>Thu, 01 Oct 2026 20:20:26 +0100</pubDate>
              <title>Inta 35mm Anti-Freeze Valve ZERO35</title>
              <description><a href="/heat-pumps-accessories-c682/anti-freeze-valves-c685/inta-35mm-anti-freeze-valve-zero35-p21196"><img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-src="https://www.macdonaldplumbingsupplies.com/images/products/thumbnails/1670232713-74485300.png" alt="Inta 35mm Anti-Freeze Valve ZERO35"  class="lazyload" /></a>
<p><a href="/heat-pumps-accessories-c682/anti-freeze-valves-c685/inta-35mm-anti-freeze-valve-zero35-p21196">Inta 35mm Anti-Freeze Valve ZERO35</a></p>
<p>Operation

The Inta Zero is a unique antifreeze valve designed and engineered to protect heat pump systems that are operating with water.
Designed to discharge when the system water temperature drops to 3°C, preventing ice from forming in the heat pump circuit that could cause breakdown or costly damage to the system.
</p></description>
              <guid>/heat-pumps-accessories-c682/anti-freeze-valves-c685/inta-35mm-anti-freeze-valve-zero35-p21196</guid>
              <link>/heat-pumps-accessories-c682/anti-freeze-valves-c685/inta-35mm-anti-freeze-valve-zero35-p21196</link>
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              <pubDate>Thu, 01 Oct 2026 20:20:26 +0100</pubDate>
              <title>Inta Zero Anti Freeze Valve 1&quot; Male x 1&quot; Female Swivel ZERO1SW</title>
              <description><a href="/heat-pumps-accessories-c682/anti-freeze-valves-c685/inta-zero-anti-freeze-valve-1-male-x-1-female-swivel-zero1sw-p21443"><img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-src="https://www.macdonaldplumbingsupplies.com/images/products/thumbnails/1738086904-92202100.jpg" alt="Inta Zero Anti Freeze Valve 1&amp;quot; Male x 1&amp;quot; Female Swivel ZERO1SW"  class="lazyload" /></a>
<p><a href="/heat-pumps-accessories-c682/anti-freeze-valves-c685/inta-zero-anti-freeze-valve-1-male-x-1-female-swivel-zero1sw-p21443">Inta Zero Anti Freeze Valve 1&amp;quot; Male x 1&amp;quot; Female Swivel ZERO1SW</a></p>
<p>The Inta Zero Anti-Freeze Valve 1&quot; Male x 1&quot; Female Swivel ZERO1SW is designed to protect heat pump systems operating with water. It automatically discharges when the water temperature falls to 3°C, preventing ice formation that could lead to system breakdowns or costly damage.</p></description>
              <guid>/heat-pumps-accessories-c682/anti-freeze-valves-c685/inta-zero-anti-freeze-valve-1-male-x-1-female-swivel-zero1sw-p21443</guid>
              <link>/heat-pumps-accessories-c682/anti-freeze-valves-c685/inta-zero-anti-freeze-valve-1-male-x-1-female-swivel-zero1sw-p21443</link>
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          <item>
              <pubDate>Fri, 09 Oct 2026 02:05:05 +0100</pubDate>
              <title>Inta Zero Anti Freeze Valve 1¼ Male x 1¼ Female Swivel ZERO14SW</title>
              <description><a href="/heat-pumps-accessories-c682/anti-freeze-valves-c685/inta-zero-anti-freeze-valve-1-male-x-1-female-swivel-zero14sw-p21442"><img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-src="https://www.macdonaldplumbingsupplies.com/images/products/thumbnails/1738086981-65826900.jpg" alt="Inta Zero Anti Freeze Valve 1¼ Male x 1¼ Female Swivel ZERO14SW"  class="lazyload" /></a>
<p><a href="/heat-pumps-accessories-c682/anti-freeze-valves-c685/inta-zero-anti-freeze-valve-1-male-x-1-female-swivel-zero14sw-p21442">Inta Zero Anti Freeze Valve 1¼ Male x 1¼ Female Swivel ZERO14SW</a></p>
<p>The Inta Zero Anti-Freeze Valve 1¼ Male x 1¼ Female Swivel ZERO14SW is specifically designed to safeguard heat pump systems operating with water. This unique valve discharges automatically when the water temperature falls to 3°C, preventing ice formation that could lead to system breakdowns or costly damage.</p></description>
              <guid>/heat-pumps-accessories-c682/anti-freeze-valves-c685/inta-zero-anti-freeze-valve-1-male-x-1-female-swivel-zero14sw-p21442</guid>
              <link>/heat-pumps-accessories-c682/anti-freeze-valves-c685/inta-zero-anti-freeze-valve-1-male-x-1-female-swivel-zero14sw-p21442</link>
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          <item>
              <pubDate>Thu, 01 Oct 2026 20:20:26 +0100</pubDate>
              <title>MacAnti Freeze Valve 1&quot;</title>
              <description><a href="/heat-pumps-accessories-c682/anti-freeze-valves-c685/macdonald-plumbing-supplies-macanti-freeze-valve-1-p21336"><img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-src="https://www.macdonaldplumbingsupplies.com/images/products/thumbnails/1720432474-55208100.png" alt="MacAnti Freeze Valve 1&amp;quot;"  class="lazyload" /></a>
<p><a href="/heat-pumps-accessories-c682/anti-freeze-valves-c685/macdonald-plumbing-supplies-macanti-freeze-valve-1-p21336">MacAnti Freeze Valve 1&amp;quot;</a></p>
<p>The MacAnti Freeze Valve 1&quot; is designed to enable the antifreeze function in systems exposed to low outside air temperatures. This valve ensures the circuit medium is drained when temperatures reach an average value of 3℃, preventing ice formation and protecting your system, typically used with heat pumps, from potential damage.</p></description>
              <guid>/heat-pumps-accessories-c682/anti-freeze-valves-c685/macdonald-plumbing-supplies-macanti-freeze-valve-1-p21336</guid>
              <link>/heat-pumps-accessories-c682/anti-freeze-valves-c685/macdonald-plumbing-supplies-macanti-freeze-valve-1-p21336</link>
            </item>
          <item>
              <pubDate>Thu, 01 Oct 2026 20:20:26 +0100</pubDate>
              <title>MacAnti Freeze Valve 1¼&quot;</title>
              <description><a href="/heat-pumps-accessories-c682/anti-freeze-valves-c685/macdonald-plumbing-supplies-macanti-freeze-valve-1-p21337"><img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-src="https://www.macdonaldplumbingsupplies.com/images/products/thumbnails/1720432362-54377900.png" alt="MacAnti Freeze Valve 1¼&amp;quot;"  class="lazyload" /></a>
<p><a href="/heat-pumps-accessories-c682/anti-freeze-valves-c685/macdonald-plumbing-supplies-macanti-freeze-valve-1-p21337">MacAnti Freeze Valve 1¼&amp;quot;</a></p>
<p>The MacAnti Freeze Valve 1¼&quot; is designed to enable the antifreeze function in systems exposed to low outside air temperatures. This valve ensures the circuit medium is drained when temperatures reach an average value of 3℃, preventing ice formation and protecting your system, typically used with heat pumps, from potential damage.</p></description>
              <guid>/heat-pumps-accessories-c682/anti-freeze-valves-c685/macdonald-plumbing-supplies-macanti-freeze-valve-1-p21337</guid>
              <link>/heat-pumps-accessories-c682/anti-freeze-valves-c685/macdonald-plumbing-supplies-macanti-freeze-valve-1-p21337</link>
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              <pubDate>Thu, 01 Oct 2026 20:20:26 +0100</pubDate>
              <title>MacAnti Freeze Valve 28mm</title>
              <description><a href="/heat-pumps-accessories-c682/anti-freeze-valves-c685/macdonald-plumbing-supplies-macanti-freeze-valve-28mm-p21335"><img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-src="https://www.macdonaldplumbingsupplies.com/images/products/thumbnails/1721915465-78010400.png" alt="MacAnti Freeze Valve 28mm"  class="lazyload" /></a>
<p><a href="/heat-pumps-accessories-c682/anti-freeze-valves-c685/macdonald-plumbing-supplies-macanti-freeze-valve-28mm-p21335">MacAnti Freeze Valve 28mm</a></p>
<p>The MacAnti Freeze Valve 28mm is designed to enable the antifreeze function in systems exposed to low outside air temperatures. This valve ensures the circuit medium is drained when temperatures reach an average value of 3℃, preventing ice formation and protecting your system, typically used with heat pumps, from potential damage.</p></description>
              <guid>/heat-pumps-accessories-c682/anti-freeze-valves-c685/macdonald-plumbing-supplies-macanti-freeze-valve-28mm-p21335</guid>
              <link>/heat-pumps-accessories-c682/anti-freeze-valves-c685/macdonald-plumbing-supplies-macanti-freeze-valve-28mm-p21335</link>
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              <pubDate>Fri, 09 Oct 2026 02:05:05 +0100</pubDate>
              <title>MacAntifreeze Valve 28mm V2</title>
              <description><a href="/heat-pumps-accessories-c682/anti-freeze-valves-c685/macdonald-plumbing-supplies-macantifreeze-valve-28mm-v2-p23312"><img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-src="https://www.macdonaldplumbingsupplies.com/images/products/thumbnails/1738770744-31042300.png" alt="MacAntifreeze Valve 28mm V2"  class="lazyload" /></a>
<p><a href="/heat-pumps-accessories-c682/anti-freeze-valves-c685/macdonald-plumbing-supplies-macantifreeze-valve-28mm-v2-p23312">MacAntifreeze Valve 28mm V2</a></p>
<p>The MacAntifreeze Valve 28mm V2 is a highly effective solution for protecting heat source pump systems from freezing temperatures. Automatically activating when the temperature drops to 3°C, this valve opens the flow and return circuit to prevent ice formation, safeguarding the system from potential damage. With no need for glycol or ongoing maintenance, it offers a cost-effective and low-maintenance solution to ensure smooth operation in cold weather.</p></description>
              <guid>/heat-pumps-accessories-c682/anti-freeze-valves-c685/macdonald-plumbing-supplies-macantifreeze-valve-28mm-v2-p23312</guid>
              <link>/heat-pumps-accessories-c682/anti-freeze-valves-c685/macdonald-plumbing-supplies-macantifreeze-valve-28mm-v2-p23312</link>
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              <pubDate>Fri, 09 Oct 2026 02:05:05 +0100</pubDate>
              <title>Primary Pro Pre Made Insulation Jacket For Intatec 1 1/4 Anti Freeze Valve (AS52)</title>
              <description><a href="/heat-pumps-accessories-c682/primary-pro-insulation-accessories-c686/primary-pro-pre-made-insulation-jacket-for-intatec-1-1-4-anti-freeze-valve-as52-p20151"><img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-src="https://www.macdonaldplumbingsupplies.com/images/products/thumbnails/1695809760-26803800.png" alt="Primary Pro Pre Made Insulation Jacket For Intatec 1 1/4 Anti Freeze Valve (AS52)"  class="lazyload" /></a>
<p><a href="/heat-pumps-accessories-c682/primary-pro-insulation-accessories-c686/primary-pro-pre-made-insulation-jacket-for-intatec-1-1-4-anti-freeze-valve-as52-p20151">Primary Pro Pre Made Insulation Jacket For Intatec 1 1/4 Anti Freeze Valve (AS52)</a></p>
<p>The Primary Pro Pre-Made Insulation Jacket is designed specifically for the 1 1/4″ Intatec Anti-Freeze Valve. This insulation shell provides efficient protection, ensuring the longevity of your Intatec valve. Tailored for heat pump systems, it is a crucial component for external heating pipelines and accessories.</p></description>
              <guid>/heat-pumps-accessories-c682/primary-pro-insulation-accessories-c686/primary-pro-pre-made-insulation-jacket-for-intatec-1-1-4-anti-freeze-valve-as52-p20151</guid>
              <link>/heat-pumps-accessories-c682/primary-pro-insulation-accessories-c686/primary-pro-pre-made-insulation-jacket-for-intatec-1-1-4-anti-freeze-valve-as52-p20151</link>
            </item>
          <item>
              <pubDate>Thu, 01 Oct 2026 20:20:26 +0100</pubDate>
              <title>Primary Pro Pre Made Insulation Jacket For Intatec 1&quot; Anti Freeze Valve (AS33)</title>
              <description><a href="/heat-pumps-accessories-c682/primary-pro-insulation-accessories-c686/primary-pro-pre-made-insulation-jacket-for-intatec-1-anti-freeze-valve-as33-p18861"><img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-src="https://www.macdonaldplumbingsupplies.com/images/products/thumbnails/1690276228-68248300.png" alt="Primary Pro Pre Made Insulation Jacket For Intatec 1&amp;quot; Anti Freeze Valve (AS33)"  class="lazyload" /></a>
<p><a href="/heat-pumps-accessories-c682/primary-pro-insulation-accessories-c686/primary-pro-pre-made-insulation-jacket-for-intatec-1-anti-freeze-valve-as33-p18861">Primary Pro Pre Made Insulation Jacket For Intatec 1&amp;quot; Anti Freeze Valve (AS33)</a></p>
<p>The Primary Pro Insulation offers pre-made protection for your Intatec 1&quot; anti-freeze valve. With a unique UV-resistant and weather-proof coating, it ensures durable shielding against the elements. Specifically designed for heat pump system external heating pipelines and accessories, it pairs perfectly with Condensate Pro Bond &amp;amp; Seal for secure insulation joints.</p></description>
              <guid>/heat-pumps-accessories-c682/primary-pro-insulation-accessories-c686/primary-pro-pre-made-insulation-jacket-for-intatec-1-anti-freeze-valve-as33-p18861</guid>
              <link>/heat-pumps-accessories-c682/primary-pro-insulation-accessories-c686/primary-pro-pre-made-insulation-jacket-for-intatec-1-anti-freeze-valve-as33-p18861</link>
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              <pubDate>Fri, 09 Oct 2026 02:05:05 +0100</pubDate>
              <title>Primary Pro Pre Made Insulation Jacket For Intatec 28mm Anti Freeze Valve (AS32)</title>
              <description><a href="/heat-pumps-accessories-c682/primary-pro-insulation-accessories-c686/primary-pro-pre-made-insulation-jacket-for-intatec-28mm-anti-freeze-valve-as32-p18860"><img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-src="https://www.macdonaldplumbingsupplies.com/images/products/thumbnails/1690276135-76352500.png" alt="Primary Pro Pre Made Insulation Jacket For Intatec 28mm Anti Freeze Valve (AS32)"  class="lazyload" /></a>
<p><a href="/heat-pumps-accessories-c682/primary-pro-insulation-accessories-c686/primary-pro-pre-made-insulation-jacket-for-intatec-28mm-anti-freeze-valve-as32-p18860">Primary Pro Pre Made Insulation Jacket For Intatec 28mm Anti Freeze Valve (AS32)</a></p>
<p>The Primary Pro Pre-Made Insulation Jacket is tailored for the Intatec 28mm anti-freeze valve. Its unique UV-protected and weather-resistant coating guarantees enduring protection. Specifically designed for heat pump system external heating pipelines and accessories, it pairs seamlessly with Condensate Pro Bond &amp;amp; Seal for a secure seal on all insulation joints.</p></description>
              <guid>/heat-pumps-accessories-c682/primary-pro-insulation-accessories-c686/primary-pro-pre-made-insulation-jacket-for-intatec-28mm-anti-freeze-valve-as32-p18860</guid>
              <link>/heat-pumps-accessories-c682/primary-pro-insulation-accessories-c686/primary-pro-pre-made-insulation-jacket-for-intatec-28mm-anti-freeze-valve-as32-p18860</link>
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