Magento: send email using email template file

1. in your config.xml define the template before end globel tag like:

<template>
            <email>
                <status_changed module="warrantyclaim">
                    <label>Job Confirmation</label>
                    <file>warrantyclaim/status_changed.html</file>
                    <type>html</type>
                </status_changed>
            </email>
        </template>
     </global>
</config>

2. app/locale/en_US/template/email/warrantyclaim/status_changed.html

<!--@Status updated for claim Id  @-->
<!--@vars
{"var emailId":"Email Id",
"var claimId":"Claim Id",
}
@-->

<!--@styles
@-->

{{template config_path="design/email/header"}}
{{inlinecss file="email-inline.css"}}

<table cellpadding="0" cellspacing="0" border="0">
    <tr>
        <td class="action-content">
            <h2>Hi,</h2>
            <p>
               Your claim Id : <strong>{{var claimId}} </strong> status has been update please check your claim status using following data.
            </p>
            <p><strong>Email Id : </strong>{{var emailId}}</p>
            <p><strong>Claim Id : </strong>{{var claimId}}</p>
            <p><a href="{{store url=''}}warranty/?activtab=claim">Check your claim status</a></p>
            <p>
                With Regards,<br>
                VGOD Talent Acquisition
            </p>
        </td>
    </tr>
</table>

{{template config_path="design/email/footer"}}

3. In your controler file:

if($data['status'] !== $modelnew->getStatus()){
					// Send email for Applicant 
					$this->__sendMailToUser($model);
				}
				
				$model->save();

4.In controller create the function

 
protected function __sendMailToUser($claim){
    
    $senderName = Mage::getStoreConfig('trans_email/ident_custom2/name'); 
    $senderEmail = Mage::getStoreConfig('trans_email/ident_custom2/email');
    $mailTemplate = Mage::getModel('core/email_template')->loadDefault('status_changed');
    $vars = array(
                'claimId' 		=> $claim->getClaimId(),
                'emailId' 		=> $claim->getEmailId(),
                );
    $mailTemplate->getProcessedTemplate($vars);
    $mailTemplate->setSenderName($senderName);
    $mailTemplate->setSenderEmail($senderEmail);
    $mailTemplate->setTemplateSubject(Mage::helper('warrantyclaim')->__('Status updated for claim Id : %s',$claim->getClaimId()));
    $mailTemplate->send($claim->getEmailId(), $claim->getEmailId(), $vars);
}