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<a href="index.html">Home</a> / <a href="heat-boilers.html">Boilers</a> / <span class="last">Closed Combustion</span>
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<h1>Closed Combustion</h1>
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<p class="lead">Sealed combustion boilers use fans and ducted air vents which improve the performance of a Low Mass Boiler.</p>
<p>They also provide low NOx for emission requirements. Generally, these units also ship with upgraded ignition systems that allow for staged thermal performance for different seasonal loads.</p>
<p>The reason this technology was developed was to meet the newer anti-smog regulations, which were largely driven by NOx emission. These systems burn the fuel more thoroughly and release less smog.</p>
<p>BioTherm offers three closed combustion boiler models: HiDelta, Delta Limited, and MVB.</p>
<hr>
<h3>HiDelta</h3>
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<img class="img-fluid" src="http://biothermsolutions.com/images/made/chrootassets/uploads/products-applications/Hi_Delta_500_377_60_s.jpg" maxHeight="200" width="500" height="377" alt="BioTherm HiDelta" class="img-fluid" />
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<div class="col-sm-7">
<table class="table table-bordered">
<thead>
<th>Model Number</th>
<th>Full Input in BTUH</th>
<th>Flue Diameter</th>
<th>Stages</th>
</thead>
<tbody>
<tr>
<td>H3-HD101</td>
<td>100,000</td>
<td >4"</td>
<td >2</td>
</tr><tr>
<td>H3-HD151</td>
<td>150,000</td>
<td >4"</td>
<td >2</td>
</tr><tr>
<td>H3-HD201</td>
<td>199,000</td>
<td >5"</td>
<td >2</td>
</tr><tr>
<td>H3-HD251</td>
<td>250,000</td>
<td >5"</td>
<td >2</td>
</tr><tr>
<td>H3-HD301</td>
<td>299,000</td>
<td >5"</td>
<td >2</td>
</tr><tr>
<td>H3-HD401</td>
<td>399,000</td>
<td >5"</td>
<td >2</td>
</tr><tr>
<td>H3-302B</td>
<td>300,000</td>
<td >5"</td>
<td >2</td>
</tr><tr>
<td>H3-402B</td>
<td>399,000</td>
<td >6"</td>
<td >2</td>
</tr><tr>
<td>H3-502B</td>
<td>500,000</td>
<td >6"</td>
<td >2</td>
</tr><tr>
<td>H3-652B</td>
<td>650,000</td>
<td >8"</td>
<td >2</td>
</tr><tr>
<td>H3-752B</td>
<td>700,000</td>
<td >8"</td>
<td >2</td>
</tr><tr>
<td>H3-902B</td>
<td>900,000</td>
<td >8"</td>
<td >2</td>
</tr><tr>
<td>H8-992B</td>
<td>990,000</td>
<td >10"</td>
<td >3</td>
</tr><tr>
<td>H9-1262B</td>
<td>1,260,000</td>
<td >12"</td>
<td >4</td>
</tr><tr>
<td>H9-1532B</td>
<td>1,530,000</td>
<td >12"</td>
<td >4</td>
</tr><tr>
<td>H9-1802B</td>
<td>1,800,000</td>
<td >14"</td>
<td >4</td>
</tr><tr>
<td>H9-2002B</td>
<td>1,999,000</td>
<td >14"</td>
<td >4</td>
</tr><tr>
<td>H9-2072B</td>
<td>2,070,000</td>
<td >14"</td>
<td >4</td>
</tr><tr>
<td>H9-2342B</td>
<td>2,340,000</td>
<td >16"</td>
<td >4</td>
</tr>
</tbody>
</table>
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<a href="http://cdn.globalimageserver.com/fetchDocument.aspx?id=5c65cf8c-83a3-4cc1-9aa7-f5838aec03de" class="btn btn-hydro" target="_blank">Download Brochure</a>
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</div><hr>
<h3>Delta Limited</h3>
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<img class="img-fluid" src="http://biothermsolutions.com/images/made/chrootassets/uploads/products-applications/DeltaLimited_500_332_60_s.jpg" maxHeight="200" width="500" height="332" alt="BioTherm Delta Limited" class="img-fluid" />
</div>
<div class="col-sm-7">
<table class="table table-bordered">
<thead>
<th>Model Number</th>
<th>Full Input in BTUH</th>
<th>Flue Diameter</th>
<th>Stages</th>
</thead>
<tbody>
<tr>
<td>H4-399B</td>
<td>399,000</td>
<td >6"</td>
<td >On/off</td>
</tr><tr>
<td>H3-499B</td>
<td>500,000</td>
<td >6"</td>
<td >2</td>
</tr><tr>
<td>H3-649B</td>
<td>650,000</td>
<td >8"</td>
<td >2</td>
</tr><tr>
<td>H3-749B</td>
<td>750,000</td>
<td >8"</td>
<td >2</td>
</tr><tr>
<td>H3-899B</td>
<td>900,000</td>
<td >8"</td>
<td >2</td>
</tr><tr>
<td>H3-989B</td>
<td>990,000</td>
<td >10"</td>
<td >2</td>
</tr><tr>
<td>H8-1259B </td>
<td>1,260,000</td>
<td >12"</td>
<td >3</td>
</tr><tr>
<td>H9-1529B </td>
<td>1,530,000</td>
<td >12"</td>
<td >4</td>
</tr><tr>
<td>H9-1799B </td>
<td>1,800,000</td>
<td >14"</td>
<td >4</td>
</tr><tr>
<td>H9-1999B </td>
<td>1,999,000</td>
<td >14"</td>
<td >4</td>
</tr><tr>
<td>H9-2069B </td>
<td>2,070,000</td>
<td >14"</td>
<td >4</td>
</tr><tr>
<td>H9-2339B </td>
<td>2,340,000</td>
<td >16"</td>
<td >4</td>
</tr>
</tbody>
</table>
</div>
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</div>
</div><hr>
<h3>MVB</h3>
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<img class="img-fluid" src="http://biothermsolutions.com/images/made/chrootassets/uploads/products-applications/MVB_399_600_60_s.jpg" maxHeight="200" width="399" height="600" alt="BioTherm MVB" class="img-fluid" />
</div>
<div class="col-sm-7">
<table class="table table-bordered">
<thead>
<th>Model Number</th>
<th>Full Input in BTUH</th>
<th>Flue Diameter</th>
<th>Stages</th>
</thead>
<tbody>
<tr>
<td>H7-504A</td>
<td>500,000</td>
<td >8"</td>
<td >Modulating </td>
</tr><tr>
<td>H7-754A</td>
<td>750,000</td>
<td >10"</td>
<td >Modulating</td>
</tr><tr>
<td>H7-1104A</td>
<td>1,100,000</td>
<td >10"</td>
<td >Modulating</td>
</tr><tr>
<td>H7-1504A</td>
<td>1,500,000</td>
<td >12"</td>
<td >Modulating</td>
</tr><tr>
<td>H7-2004A</td>
<td>1,999,000</td>
<td >14"</td>
<td >Modulating</td>
</tr>
</tbody>
</table>
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